[amibroker] AmiBroker keeps crashing

[rnash1000]

I just started backtesting with intraday data using 4 years worth of 5 
minute bars on 4160 stocks.  My first 2 runs went well, but since then 
AmiBroker (Version 5.00.1) has crashed every time.  It never crashed 
when I used 10 years of end of day data on 8000 stocks. My operating 
system is Windows Vista 64 bit.  Any suggestions?