Looks to me like a 2 HP, 220V, single-phase, 8.5 Amps, 60 Hz, 1725 RPM motor.
First check your connections are tight and utility power is in spec. I've been in a house where the voltage was 30% low for 2 months before they fixed the transformer on the tower.
Next check all the shafts, bearings, etc. to see if anything is binding up and robbing you of tool power.
Finally it could be a failing motor or motor capacitor, but that is unlikely.
How did you come to the conclusion you are losing power? Tool cutting poorly? Could this be a dull tool or mystery metal issue?