I have an N scale 2-8-0  dcc ready  that i have converted.   the loco ran well for a few weeks,  then it stall randomly
around the layout never in the same place. if i go to the loco and touch it it starts again (and i do mean very light touch)
i have several other locos that all work fine with out issue.
Here is what i have done before you ask 
1 cleaned the track several times.
2 cleaned the loco wheels
  i have a power buss under the layout with feeds about every 3 feet
re-soldered the connections to look for cold solder joints i have looked for binding in the linkage i do not see any.
 

I have an n-scale 4-8-4 I have converted to dcc but the decoder runs very hot so hot it will burn up.  I have run it with only the motor running/connected setting on my bench so I know it is the motor drawing too much current am I missing something or is there a better motor to install in this loco.