Audio cutting out on playback

I am editing a video in FCP X and the audio keeps cutting out in playback.
The video is mainly comprised of .mov files converted from M2T files using the Apple ProRes 422(HQ) codec. There are one or two .mov files supplied by another camera operator with lower spec, but these are not problematic.
I had no problems with previous projects using the same files, but this time the audio is constantly cutting out on playback. It seems to be fine on export which is a relief but the playback problem is making editing very difficult.
Does anyone have any advice?
I am using:
MacBook Pro
OS 10.8.4
Processor: 2.7GHz Intel Core i7
RAM: 8GB 1600 MHz DDR3
Graphics: Intel HD Graphics 4000 384 MB
Final Cut Pro X 10.0.9
Thanks.

Hi
Sorry for the delay in replying.
The video was filmed on a SonyZ7 camera which created M2T files. These were then converted using Pavtube MTS-M2TS Converter. I converted them to .mov files using the Apple ProRes 422 (HQ) codec.
I used the default audio settings for the conversion which are:
Codec: pcm_s16le (no other options)
Sample rate: 44100 (only other option is 44800)
Bitrate: 352800 (only other option is 38400)
Channels: stereo
The only changes I've made to the audio in FCPX are to adjust volume, add fades, and in some cases remove one of the channels and turn the other one into dual mono.
I've also now cleared some space on my Macbook harddrive as I wondered if that was the problem, it's now less than 50% full and it's still an issue. It doesn't seem to be a RAM issue as I have the MemoryFreer app and this happens even when I have plenty of free memory.
Hope someone can help?
Thanks
Elspeth

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Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
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Jaco
****I am not an HP employee****
Please give a" Kudos" if advice received is relevant or" Accept as Solution" if your problem has been solved.
+++++++++++++++++++++++++++++++++++++++++++++++++++++
H8 1380t CTO, Intel i7 3820
16 GB DDR3
Pegatron Motherboard- IPIWB-PB (Pittsburgh), Radeon HD 7570 1GB. Win 7 Home Premium upgraded to Windows 8.1 Pro.
Envy Phoenix 810-150se, Intel i7 4820k
16 GB DDR3
Pittsburgh2 Mainboard, NVIDIA GTX 645- 2GB GDDR5. Win 8.1 Pro.
HP 560z CTO AMD Phenom II X6 1090T
16 GB DDR3.
Radeon HD 6570
Win 7 Home Premium upgraded to Win 7 Pro.
HP ENVY 17t-j000 CTO Quad Edition Notebook. I7 4702mq
12 GB DDR3
Nvidia Graphics
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Errare humanum est.

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