Well I guess I must be doing something wrong but the failure mode is not consistent. From left to right.
1 Totally dead. It shut down on passage and nothing I did raised a beep or anything on screen.
2 Still works but usually goes to a blank display with a black vertical line after a few minutes. Does not respond to power off button, but unplugging and plugging in will restart it.
3 On connection it powers up without use of the on button and finds satellites and displays a position. Does not respond to any button input.
4 On power up it finds a satellite or two then shuts down.
5 Yup I am crazy I bought number 5 today. So far so good!
PS Yes I do still have a sextant and about once a year I shoot the mid day sun for old times sake and calculate my position.