Power meter connection lost during ride – Edge 1040, FW 27.14

Update: same issue occurred again:
On yesterday’s ride, after a mass sensor disconnection, I noticed that both power and cadence were stuck at 0.

Surprisingly, both the Rally power meter and the cadence sensor still showed as “connected” in the sensor list.

Only after manually disconnecting and reconnecting the sensors did the data resume.

Unfortunately, the recording was already compromised; and this happened on what turned out to be my best time ever on a route I ride almost daily.

I know that correlation does not imply causation, and this behaviour wasn’t newly introduced in version 27.14, but there are growing signs that this version has made things worse.

I have the dual sided Giant power meter that came installed on the bike.  It loses connection exactly twice every ride after the  update. If I don't catch the disconnection, my ride data is shot. If i catch it early enough, I can disconnect and reconnect to get the recording to start again.

This happened to me today. Quarq power sensor. First part of the ride to coffee stop everything was fine. After resumption noticed power was reading 0, mid-ride tapped to go to Home then sensors and noticed the sensor was listed as connected but power was still 0. Luckily I was also recording on my Garmin Epix watch which was unaffected, I just saved that one and discarded the Edge 1040 one. But so annoying, by now I'm used to using the power numbers for pacing.

This seems different to the few instances before where a sensor was actually lost connection, where you see a missing value instead of 0 in the data field.

Seems like a real bug.

What did you do when you stopped?

Left the unit on?

Put it into suspend mode?

Powered it off?

I put it in sleep mode, as I usually do. Then woke up when ready to ride again, spun the cranks to make sure power meter woke up.

do you use sleep mode or power off mode?

Just to clarify my case: I always use full power off between rides, never sleep mode. In my experience, sleep mode almost always causes issues with sensors and accessories not reconnecting properly.

However, the dropouts I reported here are not related to any pause or restart. Both incidents happened mid-ride, with no stops or interaction with the device.

Also worth noting: the cases I described here involve the power meter specifically. Similar issues i have involving other accessories (e.g. lights, speed/cadence sensors, radars, cameras) are described in their own threads.