windowserver high cpu + system crashes

my MacBook Pro crashes a few times per day. in safe mode it seems to be better. I noticed in activity monitor that windowserver uses much cpu and memory, also in safe mode. but can't find the cause.

I tried already a lot:

- apple store performed different checks and said the hardware is ok, so it should be a software problem that I should fix myself

- update every time to new OS (now Mojave) and updates

- uninstall many apps

- reinstall OS

- repair disk permissions

- reset PRAM

- mission control - unselect display separate spaces

- display - selection default and scaled

- energy saver - unselect automatic graphic switching

- accessibility - select reduce transparency

who can help me?

here is the etrecheck report:

EtreCheck version: 5.0.2 (5015)

Report generated: 2018-11-10 22:42:26

Download EtreCheck from https://etrecheck.com

Runtime: 1:25

Performance: Excellent

Sandbox: Enabled

Full drive access: Enabled

Problem: Other problem

Major Issues:

Anything that appears on this list needs immediate attention.

Time Machine backup out-of-date - The last Time Machine backup is over 10 days old.

Kernel panics - This system has experienced kernel panics. This could be a sign of hardware failure.

Minor Issues:

These issues do not need immediate attention but they may indicate future problems.

Time Machine auto backup disabled - Time Machine auto backups are disabled.

Clean up - There are orphan files that could be removed.

Abnormal shutdown - Your machine shut down abnormally.

Hardware Information:

MacBook Pro (Retina, 15-inch, Mid 2015)

MacBook Pro Model: MacBookPro11,5

1 2,5 GHz Intel Core i7 (i7-4870HQ) CPU: 4-core

16 GB RAM - Not upgradeable

BANK 0/DIMM0 - 8 GB DDR3 1600 ok

BANK 1/DIMM0 - 8 GB DDR3 1600 ok

Battery: Health = Normal - Cycle count = 541

Video Information:

AMD Radeon R9 M370X - VRAM: 2048 MB

Color LCD 1680 x 1050

Intel Iris Pro - VRAM: 1536 MB

Drives:

disk0 - APPLE SSD SM0512G 500.28 GB (Solid State - TRIM: Yes)

Internal PCI 8.0 GT/s x4 Serial ATA

disk0s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk0s2 [APFS Container] 500.07 GB

disk1 [APFS Virtual drive] 500.07 GB (Shared by 4 volumes)

disk1s1 - A***************D (APFS) (Shared - 446.29 GB used)

disk1s2 - Preboot (APFS) [APFS Preboot] (Shared)

disk1s3 - Recovery (APFS) [Recovery] (Shared)

disk1s4 - VM (APFS) [APFS VM] (Shared - 1.07 GB used)

Mounted Volumes:

disk1s1 - A***************D 500.07 GB (50.41 GB free)

APFS

Mount point: /

disk1s4 - VM [APFS VM] (Shared - 1.07 GB used)

APFS

Mount point: /private/var/vm

Network:

Interface en0: Wi-Fi

802.11 a/b/g/n/ac

Interface en4: iPhone

Interface en3: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

System Software:

macOS Mojave 10.14.1 (18B75)

Time since boot: About an hour

Security:

Kernel Extensions:

/Library/Application Support/Citrix Receiver

CitrixGUSB.kext (Citrix Systems, Inc., 18.9.0 - SDK 10.9)

/Library/Extensions

Soundflower.kext (2.0b2 - SDK 10.10)

System Launch Agents:

System Launch Daemons:

Launch Agents:

Launch Daemons:

User Launch Agents:

User Login Items:

CleanMyMac 3 Menu.app (MacPaw Inc. - installed 2018-09-25)

(/Applications/CleanMyMac 3.app/Contents/MacOS/CleanMyMac 3 Menu.app)

Dropbox.app (Dropbox, Inc. - installed 2018-11-08)

(/Applications/Dropbox.app)

Internet Plug-ins:

FlashPlayer-10.6: 29.0.0.171 (installed 2018-06-21)

QuickTime Plugin: 7.7.3 (installed 2018-11-07)

AdobePDFViewerNPAPI: 17.012.20098 (installed 2018-10-30)

AdobePDFViewer: 19.008.20080 (installed 2018-10-30)

Flash Player: 29.0.0.171 (installed 2018-06-21)

CitrixICAClientPlugIn: 18.9.0 (installed 2018-10-06)

Silverlight: 5.1.50901.0 (installed 2018-09-30)

User Internet Plug-ins:

ZoomUsPlugIn: 4.1.19666.0122 (installed 2018-01-30)

Safari Extensions:

3rd Party Preference Panes:

Flash Player (installed 2018-04-29)

Time Machine:

Skip System Files: No

Mobile backups:

Auto backup: No

Volumes being backed up:

A***************D: Disk size: 500.07 GB - Disk used: 449.66 GB

Destinations:

D**a [Network] (Last used)

Total size: 997.71 GB

Total number of backups: 25

Oldest backup: 2017-12-30 13:18:53

Last backup: 2018-10-30 23:46:11

Performance:

System Load: 1.60 (1 min ago) 1.56 (5 min ago) 1.65 (15 min ago)

Nominal I/O speed: 0.87 MB/s

File system: 18.26 seconds

Write speed: 690 MB/s

Read speed: 1966 MB/s

CPU Usage:

Top Processes by CPU:

Top Processes by Memory:

Top Processes by Network Use:

Virtual Memory Information:

Software Installs (past 30 days):

Clean up:

/Library/LaunchAgents/com.citrix.ServiceRecords.plist

/usr/local/libexec/ServiceRecords.app/Contents/MacOS/ServiceRecords

Executable not found

/Library/LaunchAgents/com.microsoft.update.agent.plist

/Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app/Contents/MacOS/Microsoft AU Daemon.app/Contents/MacOS/Microsoft AU Daemon

Executable not found

/Library/LaunchAgents/com.citrix.ReceiverHelper.plist

/usr/local/libexec/ReceiverHelper.app/Contents/MacOS/ReceiverHelper

Executable not found

Diagnostics Information (past 7 days):

2018-11-10 21:27:54 Last Shutdown Cause: 3 - Hard shutdown

2018-11-10 16:47:17 Kernel Panic (47 times)

End of report