ATC waits until I’m just 30 miles away from dest to descend

[JamAir421]

@Prodiceman56

Also when it does work and I am on final approach at 3000, it tells me to go up to 7000.

I seem to get that a lot if I request and altitude change at some point during the flight. It will tell me to go back up to the original filed alt. then a short time later drop me to the approach alt.