Communication timeout - reset send buffer block and Error:checksum mismatch

I’ve been using the Lowrider cnc for 4 years, using an arduino and repetier host.

Recently I’ve been getting the following problems:
Communication timeout - reset send buffer block

and
Error:checksum mismatch, Last Line: 5645

This is causing huge problems, as the machine travels to readjust itself, essentially cutting non-cutting travel moves.

I use a powered USB to control the machine from my laptop. In an attempt to identify the problem, I ran the exact same code from an SD card and it works fine.

So I think the problem is with my USB to the ardruino, but I don’t understand why this problem has just arisen after 4 years…

Any suggestions?

Do you plug and unplug your USB cable regularly?

Maybe you’ve worn out either the cable or the connectors on your Arduino or Laptop…

Try replacing the USB cable first.

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