I can't figure out why this keeps happening intermittently. It's not the thermal fuse, the wiring is fine, the relay is okay, the heater (Keenovo) is okay, and the thermistor for the heater seems to be fine.

Once it gets to 110, it is usually fine, and prints finish without issue. It's getting there that usually takes a couple tries.

What else could be causing the heater to just stop heating when going up to 110 degrees?

Edit: I should have said that when it stops heating it does so like the heater was just turned off. It usually doesn't come back on, but now that I've increased the timeout l, it will maybe come back on but still turn back off again.