ROLL LEFT AFTER LIFTOFF
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This sounds like the Autopilot has somehow become engaged. It may/may not show the switch on in the VC, but you can check if this is happening by looking in your control settings, keyboard, for the key that toggles AP on and off. Next time it happens, just hit that key, and see if you can fly the plane normally.
If you can, something is turning the AP on. It’s up to you to investigate that on your system.