I have a 1-year-old oil-less compressor (5.5hp, 25gl). It has recently started to act funny. The compressor only charges up to 120-130 randomly each time I turn it on. It used to charge to 135. It eventually charges up there but I have to bleed air and let the motor run a few times. I have cleaned the air filter and check valve. I even tried running it without the air filter but to no avail. Any suggestions?