Pump holds prime and found no leaks but after a few times we run the water or flush the toilet we lose water pressure and eventually lose water completely. Pump has a reset button and when we push that water returns but after each flush or two we have to keep hitting the reset button. We have to go up a hill with a hose about 125 ft to travel trailer. Tried everything any suggestions or answers. Use a 1/2hp leader pump

Sounds like pump is over heating. Why would it do that? Is pump shutting off properly?

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we have to go up a hill with a hose about 125 ft to travel trailer.

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Don't understand that statement.

I'd call the pump manufacturer and see if you can find out why the reset button is tripping. Or, if you will post the make/model of the pump, we might be able to find that on the web. I think HK is on the right track here. It is probably a thermal protection circuit of some sort that is turning off the pump when it overheats.