Unknown age, was installed in kitchen when we bought house.
The oven turns itself off when left on for a longer period of time. Can’t tell you how many meals have been ruined.
It seems ok for about an hour but at some point after that it just stops heating. It is an older oven, no digital readout, no error messages, it just stops working.
Repairman has replaced the thermostat, and several other parts to no avail.