Flair pucks jump to 89

I have a number of flair pucks that have been working for a few years. Two of them are now exhibiting a behavior in which any rotation of the dial causes the set point to jump to 89. Once it does that, rotating the dial doesn't have any impact - it just stays at 89. If I look at the set temperature in the flair app, after the puck has jumped to 89, it indicates that the set point has been changed to 90. If I clear the hold in the app, the puck returns to the correct set point unless I try to rotate it again, at which point it jumps again to 89.

Are these just broken?

Thanks.

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