Welcome to the forum.
Can you look over this FAQ Entry on what information would be very useful in diagnosing your problem? http://forums.adobe.com/thread/961741?tstart=0
Good luck, and please let us know more,
We need more informations, especially about the hardware. I'll think your hardware is insufficient to work with AVCHD
How long are the clips? Over 20 minutes?
Iwork on a pc I5 use gpu ecceleration. windows 7
it happens only with MTS files usually when i have a long Timeline
It happens also with clips of 5 minutes
It will freeze on those shorter clips?
Looks like too weak hardware and / or ill tuned system.
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Give us some help. Specific i5, RAM, GPU, dedicated hard drive?
With what you have offered, one can only guess. Your system is behaving like a under powered system. AVCHD is a very demanding codec. When you render the timeline, you're basically converting the video on the timeline to i-frame mpeg preview footage which is easier to decode, therefore plays smoothly.
On a properly configured editing machine, Premiere CS5x and later is set up for RT editing of native codecs, or raw footage. One needs a fast 4 core processor(read intel) and adequate memory to work with AVCHD.
What you can do is transcode your raw AVCHD to MXF OP1a for an intermediate format. That is basically the workflow that FCP 7&X have done using ProRes as an intermediate. It allows for a smoother editing experience with less powerful, more consumer end computers. The intermedate files will be much bigger on your hard drive, but will edit smoothly on a less powerful machine.
If you have CS6, you can use Prelude to Select, Organize, and Transcode your raw footage, giving you a rough cut for Premiere. This will help by giving you a leg up organizing and rough cutting, but also only transcoding the footage you actually want to use. The resulting Premiere project will perform better using intermediate codec format selected in Prelude.
If you find this workflow too time consuming, you can build a machine that is more suitable for native AVCHD editing.