Hello, I have a 6101 that runs intermittently. It has only been in service about five months. I have cleaned it and reinstalled in the tank. Same problem, will run and pulse as it should, then will stop for for an hour or two then restart and run for awhile. I replaced it with another 6101 i had in the box. I used the old pumps power supply and the new pump has been working as it should for a couple of weeks. I assume the old pump is having thermal issues. May i send the pump in for repair? Thank you.