Disabled duraspeed 2-3 days ago, and today got reboot.
Edit: and even another reboot, few hours later. Both times, on boot time screen colors were inverted, white background. After inputting pin for sim colors turned to normal.
Edit2: and even 3rd reboot during same 8 hour period. There does not seem to be any regularity, phone had not been used at all, and day is similar as others, but still, lot of reboots yesterday. And during last week, one other boot.