there is no difference for me if BE is disabled/enabled, server will not crash when 1 player connected for hours but crashed couple of times when more players joined, first it was something like 4-5 players, second time I tried to disable BE and it has crashed in 30mins with about 10 players...
How many players were connected while your server were running for 6 hours?
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Could you please give me more info about your system specs? I have fresh installed VM Debian 6 Wheezy 64bit, 32libs via "apt-get install ia32-libs" and server is crashing quite often... VM should not be a problem I hope