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I updated the programs on both devices to use a more error-prone protocol for communicating (as suggested here), which is kind of similar to the NMEA 0183 protocol (basically a simplified version of that). The sender sends the data in the following format now:

I updated the programs on both devices to use a more error-prone protocol for communicating (as suggested here), which is kind of similar to the NMEA 0183 protocol (basically a simplified version of that). The sender sends the data in the following format now:

Still no success. After a while it just gets stuck on one PWM value and keeps outputting that, regardless of what it receives over serial. It's kind of like it ignores the incoming data after a day or so.

Still no success. After a while it just gets stuck on one PWM value and keeps outputting that, regardless of what it receives over serial. It's kind of like it ignores the incoming data after a day or so. I can verify that the other device still sends data correctly, since if I only restart the Arduino, everything goes back to normal.

Update 2:

Still no success. After a while it just gets stuck on one PWM value and keeps outputting that, regardless of what it receives over serial. It's kind of like it ignores the incoming data after a day or so.