I can't recall the reason but I stopped using the 905B at some point and only install the 905-TX version, which has given good service. Or an earlier PCI based one, can't remember the type, and when all else fails I fall back to the 509 and the ISA bus.

You might try running the DOS based diagnostics and see if anything shows up but based on the multiple failures on that card I suspect that you would be better off getting the TX version.

What kind of system are you dealing with, hardware wise? Most of mine is PII based but I may have some PIII.