I've just started using a 2600MC with Stellarmate on my 4Gb Pi. I've taken about 100 subs now over three nights with no issues. 

In case it helps bottom out this issue for others - the cam is connected with USB3.0 cables to a Pegasus Powerbox Advanced. Subs have mostly been 300s, so quite a bit of time between saving each one. Guide cam is a ZWO120MM.
I'm running Stellarmate v1.5.6 stable and connecting to EKOS from my laptop over VNC. Images are saved locally on the Pi.
I view each sub in the FITS viewer but with Auto DeBayer and Auto WCS off.  Since this is the stable build, I don't have the new Adaptive Sampling option.

In the ASI2600 settings, I'm saving Raw 16bit files and I don't think I've changed the bandwidth but it's set to 80, with Auto Bandwidth off.

 

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