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Stages Shimano 105 R7000 Power Meter 
Stages Cannondale Hollowgram Si Power Meter There are a few easy things you can try that usually fix this issue.
For left crank arm power meters
Please confirm that the positive battery contact is not bent downwards from the correct position, which would prevent it from contacting the positive terminal of the battery. If needed, please use your fingernail to bend it back to its original position as shown in the photo below:
If the positive terminal is in place, we can try a hard reset of the meter to see if we can get it to pair back up. Using the rounded edge of the battery, bridge to the positive and negative terminals for around 20 seconds. This will short circuit the board and should wake up the meter. Below is an example of the hard reset being performed.
Once you have performed the hard reset, please install a brand new battery and see if you are able to pair with your head unit or smartphone via the StagesPower app.
For right crank arm power meters
Please confirm that the positive battery contact is not bent downwards from the correct position, which would prevent it from contacting the positive terminal of the battery. If needed, please use your fingernail to bend it back to its original position as shown in the photo below:
If the positive terminal is in place, we can try a hard reset of the meter to see if we can get it to pair back up. Using the rounded edge of the battery, bridge to the positive and negative terminals for around 20 seconds. This will short circuit the board and should wake up the meter. Below is an example of the hard reset being performed.
Once you have performed the hard reset, please install a brand new battery and see if you are able to pair with your head unit or smartphone via the StagesPower app.