Oops...
Found the problem, it was only after trying the code on another A1200 that I found I could reduce the delay down to around 10 reads instead of 5000. I then started investigating the motherboard of my first A1200, and found that about 18 years ago I had added a couple of capacitors to the pot lines in order to increase the sensitivity of analogue joysticks. Totally forgot about that! But thanks Toni for putting me on the right trail!
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