Something not right is causing the fuse problem. In the private jet business we were trained to never, ever, ever reset a tripped breaker or fuse while in flight...unless the problem solved by resetting it is more serious than the fire that will start when the reset is accomplished.
The poor connection problems mentioned are a good troubleshooting start. If all is good there then it sounds like a fault in the motor, or the motor is not big enough for the task. I have the Husky 4,500 pound jack and it has never had a fuse problem. However, it does have micro switched cutoff at the upper and lower limits.
At some point during every day you suddenly realize nothing else productive is going to happen the rest of that day. For me, it usually occurs around 9 am.
Vengeance 25V (the Harley needed a home)