We deployed over 1k RasPi's for a particular customer. We averaged about five reboots per day. On top of that I had to deal with the RasPi Organization's insistence that they were not an ODM. Though these were the RasPi B's and RasPi2 B+'s. I'm sure the reliability has gotten better over the years.
I'm not a big TI fan, but everything I needed I got in a BeagleBone: they're more reliable than RasPi's, you can actually get the firmware source code and they have a "normal" returns process.
I don't have the data for the BBB based cube-sats running Kubos (which was the project after the RasPi project) and there were less than 50 deployed, but I've never heard of any of them rebooting themselves unless the ground told them to do so or there was a battery failure.