I have two different uno boards in two different projects that have the same problem. The program occcationally freezes in the chip. Sometimes after a couple days, Sometimes after a couple weeks. temporarily unplugging the power to reset them fixes the issue.
one of the projects is a simple thermostat with a relay and a temperature sensor.
I dont see how this could be a coding issue since the boards freeze at uneven intervolds.
has anyone had any similar problems?