Hi  @PHTP 

What do you use on your side? Can you give us more details?

1. the NTP server config;

2. Only switches are affected?

PHTP wrote

  @Vincent-TP 
We do not use Google TimeServer and have the same problem.

Hi  @PHTP 

Thanks for that info. We are working on it.

When we change the time server, it doesn't take long before only a certain type of switch fails.

>>>Can you please let us know what NTP server did you change to?  We will test it locally.

PHTP wrote

  @Vincent-TP 

I find some interesting Infos. 

When we change the time server, it doesn't take long before only a certain type of switch fails.
All other switches continue to run without any problems.

All affected switches also have the same firmware:

Model SX3008F v1.20
Firmware version 1.20.14 Build 20251226 Rel.60828