Ableton/Kontakt - CPU spikes and crashing

Hey all,

I've always had issues with Kontakt on my laptop (2014 MBP), piano library packs play fine (Imperfect samples & Alicia keys) then suddenly ramp up to over 120% CPU and cut out the audio.In the console window I get this message flooded into the log, it usually only takes a few seconds to fill the 4,000 message limit:

"08/02/2015 21:22:36.448 Live[1250]: assertion failed: 14B25: libxpc.dylib + 41185 [CB6B442F-8BE4-37B6-9A00-4753BC1C368C]: 0x13"

Today was the first day it actually crashed the program, so I thought I'd post around and see what it may be. I've tried updating, and rolling back both ableton & kontakt, but with little avail. The issue used to occur before Yosemite too so I'm a bit stuck as to what it may be.

This is the full crash log:

-----------------

Process: Live [1654]

Path: /Applications/Ableton Live 9 Suite.app/Contents/MacOS/Live

Identifier: com.ableton.live

Version: 9.1.7 [2014-12-12_411c6f8237] (9.1.7 [2014-12-12_411c6f8237])

Code Type: X86 (Native)

Parent Process: ??? [1]

Responsible: Live [1654]

User ID: 501

Date/Time: 2015-02-09 10:27:21.709 +0000

OS Version: Mac OS X 10.10.1 (14B25)

Report Version: 11

Anonymous UUID: FAC3790C-5088-4D39-29A1-55D48BE1C1D3

Sleep/Wake UUID: E194927A-184E-4081-AA7A-B77B7741ECCF

Time Awake Since Boot: 36000 seconds

Time Since Wake: 1900 seconds

Crashed Thread: Unknown

Exception Type: EXC_CRASH (SIGABRT)

Exception Codes: 0x0000000000000000, 0x0000000000000000

Backtrace not available

Unknown thread crashed with X86 Thread State (32-bit):

eax: 0x00000000 ebx: 0x00000000 ecx: 0xfc0b813c edx: 0x00000000

edi: 0xfc0ba000 esi: 0x00000006 ebp: 0xfc0b8158 esp: 0xfc0b813c

ss: 0x00000023 efl: 0x00000206 eip: 0x953b369e cs: 0x0000000b

ds: 0x00000023 es: 0x00000023 fs: 0x00000023 gs: 0x0000000f

cr2: 0xa0a57a00

Logical CPU: 0

Error Code: 0x00080148

Trap Number: 132

Binary images description not available

External Modification Summary:

Calls made by other processes targeting this process:

task_for_pid: 3

thread_create: 0

thread_set_state: 0

Calls made by this process:

task_for_pid: 0

thread_create: 0

thread_set_state: 0

Calls made by all processes on this machine:

task_for_pid: 18703

thread_create: 1

thread_set_state: 0