Connection drops periodically for a few seconds

Hello everyone,

I used 2 ZyXEL devices:

  • Firewall: USG20-VPN
  • Switch: GS1920-24HP

Two devices have been Nebula connected.

But my network is unstable, the connection drops periodically for a few seconds, maybe mili seconds, and then back to normal. This problem occurs continuously, about 10 times in 1 hour or more.

This is the result when I try to ping the default gateway:

I don't know why, please help me.

Thank you.

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