Weird Problem

[isaac]

isaac, The maximum recomended input impedance for all Microchip Processors is 10K....

Dave Purola,
N8NTA

its not for the input the pic
but i suspect its got to be the pot would try a lower vaue like 12k

[skimask]

its not for the input the pic
but i suspect its got to be the pot would try a lower vaue like 12k

Same thing most likely applies. Lower the values of the resistors.

[Bruce]

Daves' suggestion of using a fixed resistor is good too. I would replace at least one pot
with a fixed 1%, and if using an A/D input to read this I would drop the pot to around 5K
with the fixed value set to limit total current.