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Could just be another wifi device on ANT+ channel, assuming you're using 2.4GHz. Do you have a USB extension cable to get the Garmin stick as far from your computer and as close to your PM as possible?
If you've not done that, do it. You can also try splitting wifi bands if your router supports it and make sure nothing is on ANT+ channels (best option is to use 5Ghz).
My Garmin dongle is maybe 10 years old and works just fine.
hippy-
I havn't got a USB extender, it doesnt help im using a stupid mac usb-c to usb 3.0 dongle. I have checked that the usb port is getting enough power however so shouldnt be that. The Ant+ dongle couldn't be much closer really unless I had it under the bike, which would then put it at risk of sweat damage.
Did see wifi being mentioned too - I am right next to the router, strange it has never been an issue before. I sort of need the 2.5ghz for the range. Can I just change the channel and avoid overlaps with ant+? I dont fully understand channels vs ghz.
apc
Im having issues with my power dropping out regularly (every 30 seconds) suddenly, no change in set up.
I suspect its a garmin ant+ dongle issue because... garmin. (Also a couple of years ago my dongle just stopped working and I replaced it)
Is there any free software i can run to record power and see if there are similar dropouts (to take zwift out the equation)
My wahoo has no issues