Why weren't they paired before you left home? AFAIK once the Garmin devices are paired, they stay paired. If your don't then you likely need to talk to Garmin.

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Trust me I’m a doctor!
Well, I have a PhD :-)

Good question....I dont have a good answer, I will try just to leave as is once paired

if you type in the power meter ID it will stay locked on it also.

Redo the initial setup and say no when it asks if you have a PM, HR, Speed/Cadence. After, add all those in one at a time. Check that each paired by hitting "sensor details" and then click the ID number. Hit enter to save (locks it in). Problem solved.

My theory is that when people say "yes, I have a PM" during setup, it sets it to automatically check each time (since it will pick up your PM whenever you next boot it up and they are close enough). It should then lock that number in, but apparently, they don't and get confused when there are too many to pick up. I followed the above instructions and never have problems in group spins with lots of ANT+ signals flying around.

This could happen with any brand of PM & computer that weren't paired ahead of time. Same with HR monitors and watches/computers.

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I'm just this guy ya know?

So you always repair your equipment before you ride? Why would you do that?