Rs3e fault finding question

[Hubster357]

I have a trusty Rs3e sander that is old but had been still hanging in there. Sander only works when you hold it in a horizontal position. First thoughts was a dry joint or loose connection but there is not a lot of wiring in the sander, could the switch mech simply be faulty? If anyone has any thoughts it would be appreciated, it’s not ready to depart this world.

 

[Dongar]

It might be a bad cord probably a break near where it enters the sander.

 

[tsmi243]

Try whipping the cord around while it's on, see if it acts up. 

Motor brushes is another thing to look at- they get finicky when they're due for replacement.