It is unlikely that you caused any bother by pushing buttons ( though for future reference, unplugging from the supply for 5 mins and plugging back in will overide any mis hit settings )
This fault you have sounds like a defrost failure ; Once they enter defrost, if temperature increase isnt detected within certain period of time, it will shut down - this is usually confirmed by unit shutting down every 24 hours or so and if you switch supply off and back on, will run until defrost shuts down again 24 hours or so later .If this is the case, it could be either defrost heater failed in the freezer section or defrost sensor failed , or possibly broken/loose wiring .
If you are trying to fix yourself, please play safe and power down before removing any panels