Crashing every 30 mins
OOM is an out of memory error, unfortunately the only fix is the 64-bit client. The game has grown and needs access to the additional RAM that the 64-bit client uses.
If you cannot download the x64 client, then all you can do is lower your settings until the crashing stops, I believe anet where looking at ways to reduce the crashing on 32bit OS.
The OOM error has been around since before launch, the beta’s also had the same problem.