Hi, new on here. I have a pure freedom trolley system, had it for about 2 years, and for some reason every time I switch it on in the morning it runs for a second then seems to stop like its got air in it. If I crank it up for a bit on 99 and turn it back down then its fine for the rest of the day. The next day I'll have to do the same thing. Any suggestions on how to fix it?