MMI reboothing

[3.7 slp]

not a massive problem ...but over the past few weeks my MMI seems to reboot very 2 or so days on start up. Normally the screen pops right up after the car has been started but every 2-3 days it will not . I get a sound and then it takes a few mins to flip up and start.

This has only been a prob after I did a manual reboot using the 3 button reset.
has anyone had the same problem. I don't get any other reboots over the next day or two.

Does anyone have any tips.

Thanks all

PS was thinking of doing another manual reboot to see if that helps.