My 3Dexpirence stops working when I get around 3 hours into building it.

It wont let me edit it anymore. (I know it doesn't look too great but I started a few weeks ago) It wont let me scale anything or do any tool on it and it always does this when I take a long time on a physical product thingy.

 

 

As you can see at the back of it it wouldn't let me cut the cylinder off because I miss calculated my options to shape it. Though it wouldn't cut and nothing else worked and now its just stuck like this...

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