Hello,

Maybe, you have soms EMC troubles.

For my own industrial designs, I use lots of small capactors (100nF), very close to the chips, an some bigger (10-100µF), everywhere on the board.

I also use ferrite beads (pig-noses, like we call them) on the power lines and on each I/O line.

Use a star topology for your groud line. ohetwise, you are draggoing the noise trough each component.

You can also add a RC network before the supply of the controller. R = 10-100ohms C= +-100µF

A common mode choke on the power lines can also be helpful.

And last but not least... put yout stuff in a metal box.

Koen