I have had the GPS working for 2 years already, but recently my other robot's GPS values freeze when the wheel motors are in use. It's standard starterkit from ardumower shop with PCB 1.3. The mower motor can be on or off, the GPS is working great. But if I turn the wheel motors on the GPS is giving constantly 0.43 or whatever value was currently set as gpsspeed. The value will not change for minutes. And as soon as I turn the wheel motors off the values changing again with fast pace. I have opened the robot, check all connections, took out the gps module from the case (so its farther away from motors), and I have also checked that the GPS Serial3 is getting very steady 5.04V. I believe it to be something in the PCB 1.3, but can't figure this one out. Any pointers?