Shannon – thanks for your thoughtful reply. I’m sure I’ll be able to find the problem now. Answering your questions:
- I’m not switching D22 on.
- Humidity is a possibility. I’ll look for corrosion and add desiccant .
- I’ve had ants at another location but not this one…yet.
- I’ll make some tests as you suggest to isolate the problem. It might be easiest to just replace the Mayfly/modem as this station is far from my home. Then I can test the original equipment at home.
I do have a Digi modem and adapter card at all my locations. I plan to, but won’t be able to convert to new Mayfly and LTE BEE for another year as it will require substantial desk work – a winter job.