the times that the game has froze the only items i had in the chest in my house were potions and items that im waiting to sell when my speech gets higher.
Don't know what to say. Do you have a lot of saves on your PS3? On my old PS3 (probably 6-8 years old?) I had serious issues because it had short storage capacity, but even on my new one with the 500GB save capacity, I find that, if I have a save with more than 12 (I think it's mb, but I could be wrong) on it, I'll freeze regularly. Generally I just save the one I'm working on on the machine for Skyrim and my others on my online storage. Other games that are saved don't seem to affect anything though. I also notice that, with the DLCs installed I get less freezes as well. My biggest freeze areas are around Riften and Whiterun. Don't know why.
My suggestion is to make sure to just keep the save you're currently on and to be sure to turn off all auto-save functions (although I keep the character menu one on for 15 minutes 'cause I always forget to save). You may also want to turn off your image smoothing and some of your dvd and mp3 playback options on the PS3. That helped me. Watch for stuttering. That's a sure sign that you're about to freeze.