SC6000 with OS2.2 - starts up twice

Since OS2.2 I have a strange problem with one of my SC6000M. The unit always starts up twice. When I turn it on, it boots up normally. As soon as I push a button or want to use the touchscreen, it kind of crashes and restart, then it works for hours perfectly. It’s always the first startup, since 2.2. Has anyone experienced anything similar?