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About that digimode interface that I fixed: no, I didn't. Turned out on 40m the darn thing wouldn't work. Another thing got me curious: 1W went okay, 2,5W was critical and 6W killed the device right away. I'm currently hypothesizing that I have an RFI problem and experimenting with aluminium foil for shielding. Looks promising.
@dl4mat nice to have a fix!
May also be worth shoving a ferrite on the cable connecting the interface to the other device.
I had an issue where my TNC would interfere with itself (via the radio, obviously), but a ferrite on the cable to the radio fixed that.
I'm pretty sure now that it's lack of shielding. The device works for 20 minutes straight, which is outrageous, considering the previous performance, but as soon as I remove the wire that connects the make-shift aluminium shielding to my rig's gnd, I get the same old I/O error as before. Nice.