hot start issue

what would cause the starter to act like it's drawing off a low battery when the engines at running temp, but start normally when the engines cold? the battery is in good condition, and I've replaced the cables feels like the starter is drawing alot of amps when it's hot? any ideas?
tia
Rick, Ore

Get the starter checked out, the armature winding or brushes are bad.

or Cat. backpressure. Could also be wacked Initial timing set.