Besides many of the other mentioned items in other comments, loss of performance/tuning the radio components. Loss of other performance of electronic component

Besides many of the other mentioned items in other comments, loss of performance/tuning the radio components. Loss of other performance of electronic components - Eg some other form of the caps drying out and killing operations. Of the battery: storage in non ideal conditions. Folding of the company supplying the service was mentioned but I see that as most likely.