One question. What's the room temperature? This started when the heat arrived or earlier?
Um2 boards have the stepper chips soldered, they can't be easily removed (unless you have the skills).
Also it seems you have two different problems. First the extruder skips. Does it make a hard 'toc-toc' noise when that happens?
The y problem. Did you made any firmware change? It's the room temperature higher than before? Just to remove the chance try to place air moving bellow the printer. Just in case.
The feeder. It might be skipping because the ptfe coupler life might have come to his end. That's a easy part to replace and if that's the problem it will come back to print just as good as before (it's a consumable that has X amount of life depending of the temperature used).
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Kevparang 10
I do not think it is covered, you should also replace the stepper motors while your at it. But, before you do anything attempt to fix it like this:
1. Replace the A4988 stepper drivers
2. Replace the Stepper Motors
3. Replace the Control Board.
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