I have a clock that I built last year that was put into a cabinet during the summer. It works well but I have discovered what appears to be a software bug that shows up after about 8 weeks of operation. It is easily fixed by pulling the power pack and re-plugging into the wall.
This is the third time it has happened. I didn't pay attention to the first time it happened, but the second time was on December 6, 2019.
Now it has happened again on Jan 25, 2020. I have posted a video of it in case anyone is interested in seeing what it does. There is reference time clock beside the Nixie clock which is running about a second slower I believe. The Nixie clock has the wifi module and updates with ntp.
That certainly looks like the "50 days bug" that was caused by a uint32_t counter in the firmware maxing out and rolling over after ~49.7 days of continuous running.
If you have the equipment and know-how to update your own firmware then the best solution is to install the latest version from
Note that if you update the clock you also must update the ESP-01 in the WiFi module! If that's not an option for you, you should probably contact Ian through his store site, or wait a while and see if he replies here, to make other arrangements.
It has been quite a while since I've had to think about this bug. I think I recall it could be worked around by turning off Slots Mode. I think,
Look into it later when the dust is clearing off the crater.
I do have the resources to flash new firmware but due to the rarity of the problem, I think I will just recycle the power every 7 or 8 weeks as needed. Perhaps I will consider updating the thing at a later date.