@firetur 

Hi

It is recommended that you place the extender in the same room as the router to see if the problem still occurs.
If it still happens, please help collect the following questions:
1. When the problem occurs, please try to stand next to the extender and connect to the 5G of the router to test whether it can be detected and whether it can access the Internet;
2. Please provide the model number of the router.
 

@Joseph-TP My extender is located in the same room, about 3 meters from router.

1. Yes, it has strong signal from the router.

2. Router Genexis Pure-ED500

  @firetur 

Hi

When the issue arises, only the power light on the extender illuminates, indicating a likely connection to the Wi-Fi channel of the router. If you exclusively utilize the 5G network of both the router and extender, it is advised to set the 5G Wi-Fi channel of the router to 36.

If you are uncertain about adjusting the Wi-Fi channel settings on the router, it is advisable to seek assistance from the router's support team.

  @Joseph-TP Thanks, will try