[MBP 2015 El Capitan] Safari randomly crashing while surfing videos

This is the second time I am posting this, am seriously hoping for some help or at least someone telling me that they are facing the same problem. While surfing Youtube or (I suspect) videos on Facebook, Safari browser would freeze (rather unexpectedly) and render Mac un-usable. Only solution is a hard reboot. Have called Apple support, and done a clean re-install of El Capitan, albeit it worked for a week before the problem resurfaced. Tried looking into error reports on Console, but unfortunately I am no expert and can't really decipher them. Below are the 3 last lines before I did a hard reboot.

1/5/16 9:56:32.317 AM watchdogd[313]: [watchdog_daemon] @(_wd_daemon_service_thread) - service (com.apple.WindowServer) reported as unresponsive

1/5/16 9:56:33.320 AM watchdogd[313]: [watchdog_daemon] @(__wd_service_report_unresponsive_block_invoke) - failed to gather a spindump for (com.apple.WindowServer)

1/5/16 9:56:59.000 AM bootlog[0]: BOOT_TIME 1462067819 0

Also, I have tried using Chrome, it did work for a while but then bam kaput again. + it consumes wayyyy more power than Safari. Obviously, I know there's nothing wrong with Chrome since I use it on my Windows PC and it works just fine.

System: OS X El Capitan Version 10.11.4

MacBook Pro (Retina, 13-inch, Early 2015)

Processor: 2.9 GHz Intel Core i5

Memory: 8GB 1867 MHz DDR3

Graphics: Intel Iris Graphics 6100 1536 MB

attached below is my EtreCheck report, which seems to be in pretty good order tbh.

EtreCheck version: 2.9.12 (265)

Report generated 2016-05-01 10:40:28

Download EtreCheck from https://etrecheck.com

Runtime 1:30

Performance: Excellent

Click the [Support] links for help with non-Apple products.

Click the [Details] links for more information about that line.

Problem: Apps are crashing

Description:

(as above)

Hardware Information: ⓘ

MacBook Pro (Retina, 13-inch, Early 2015)

[Technical Specifications] - [User Guide] - [Warranty & Service]

MacBook Pro - model: MacBookPro12,1

1 2.9 GHz Intel Core i5 CPU: 2-core

8 GB RAM Not upgradeable

BANK 0/DIMM0

4 GB DDR3 1867 MHz ok

BANK 1/DIMM0

4 GB DDR3 1867 MHz ok

Bluetooth: Good - Handoff/Airdrop2 supported

Wireless: en0: 802.11 a/b/g/n/ac

Battery: Health = Normal - Cycle count = 190

Video Information: ⓘ

Intel Iris Graphics 6100

Color LCD 2560 x 1600

System Software: ⓘ

OS X El Capitan 10.11.4 (15E65) - Time since boot: less than an hour

Disk Information: ⓘ

APPLE SSD SM0256G disk0 : (251 GB) (Solid State - TRIM: Yes)

EFI (disk0s1) <not mounted> : 210 MB

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB

Macintosh HD (disk1) / : 249.80 GB (223.58 GB free)

Encrypted AES-XTS Unlocked

Core Storage: disk0s2 250.14 GB Online

USB Information: ⓘ

Broadcom Corp. Bluetooth USB Host Controller

Thunderbolt Information: ⓘ

Apple Inc. thunderbolt_bus

Gatekeeper: ⓘ

Mac App Store and identified developers

System Launch Agents: ⓘ

[not loaded] 7 Apple tasks

[loaded] 160 Apple tasks

[running] 71 Apple tasks

System Launch Daemons: ⓘ

[not loaded] 46 Apple tasks

[loaded] 156 Apple tasks

[running] 86 Apple tasks

Launch Agents: ⓘ

[not loaded] com.adobe.AAM.Updater-1.0.plist (2016-04-14) [Support]

Launch Daemons: ⓘ

[loaded] com.malwarebytes.MBAMHelperTool.plist (2016-04-22) [Support]

[loaded] com.microsoft.office.licensing.helper.plist (2014-02-26) [Support]

User Launch Agents: ⓘ

[loaded] com.adobe.ARM.[...].plist (2016-04-14) [Support]

[loaded] com.google.keystone.agent.plist (2016-04-22) [Support]

User Login Items: ⓘ

iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Other Apps: ⓘ

[running] com.microsoft.Office365Service.69152

[loaded] 394 Apple tasks

[running] 181 Apple tasks

Internet Plug-ins: ⓘ

AdobePDFViewerNPAPI: 11.0.0 - SDK 10.6 (2012-09-24) [Support]

SharePointBrowserPlugin: 14.6.3 - SDK 10.6 (2016-04-14) [Support]

AdobePDFViewer: 11.0.0 - SDK 10.6 (2012-09-24) [Support]

QuickTime Plugin: 7.7.3 (2016-03-12)

AdobeAAMDetect: AdobeAAMDetect 1.0.0.0 - SDK 10.6 (2012-08-09) [Support]

Default Browser: 601 - SDK 10.11 (2016-03-12)

3rd Party Preference Panes: ⓘ

Paragon NTFS for Mac ® OS X (2016-04-14) [Support]

Time Machine: ⓘ

Time Machine not configured!

Top Processes by CPU: ⓘ

6% WindowServer

2% fontd

2% kernel_task

0% cloudpaird

Top Processes by Memory: ⓘ

787 MB kernel_task

238 MB iTunes

180 MB WindowServer

180 MB mdworker(11)

131 MB Safari

Virtual Memory Information: ⓘ

3.14 GB Free RAM

4.85 GB Used RAM (1.71 GB Cached)

0 B Swap Used

Diagnostics Information: ⓘ

May 1, 2016, 09:56:59 AM Self test - passed

Once again, would appreciate help in any sort, thanks! (: