@Zhanas This version seems quite old, check to download and install the latest firmware first, then confirm if the issue persists: https://www.tp-link.com/support/download/archer-c7/#Firmware

@Itcswh Can I have a screenshot of that icon you are referring to?

@Lox Can we have the whole system log on the AX50 after the auto-reboot? Please send us the settings for the 5G network you modified to which you thought caused the router to reboot itself, a...

@Zhanas What's the router firmware version? Be sure that is up-to-date. "Letters changing about every hour" Is it possible to have a screenshot of this? This sounds weird, we will need to confirm.

@Serious_joker09 This will be followed up and analyzed by the support engineers, please check the email and confirm, thanks.

@Mark_L24 Have you downloaded and installed the Printer Controller Utility from the TP-Link website as below? https://www.tp-link.com/support/download/archer-c3150/ Then you can follow the guide to...