This is why it can crash on older computer. I think it's the old chain that make some noise. The wallet has to fight while filtering all the bad coins.

I had a strange amount in my wallet after a while.  Each time i open the wallet, it had the good amount but after a while some x2 amount.
Just have make a "repairwallet" in the debug console (click help->debug window->colsole tab) and it looks fine now. If it can help other users...