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To date, I found my old ASI294 not to produce useful bias frames (Which was a known issue with them) and my ASI2600MC produced good bias frames, I have been using the same master bias for six months. The ASI2600MM that I received very recently also appears to produce good bias frames, but I can't comment on anything longer term there, I have only had it a couple of weeks.
For a master bias, I generate that out of at least 100 bias frames, given they are fast to shoot there is no reason not to use lots of them to average out any random noise aspects really nicely.
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