RB750 freezing.

Two or three time in a day MT stop to work. Ping do not work. after a minute they continue to work. Connect to ISP not loosing. Router OS 4.2 installed.
What could be the problem?

Hmm.. I have no clue! It’s a mystery, I guess we’ll never know…

What are the more specific symptoms and maybe people could provide some assistance to you.

so ether1 works all the time? only ether2-5 stops passing traffic?
Can you login from ether1 during the freeze?
how long does it goes into the freeze?
Please make the support output file when it is in the freeze state and send that file to support@mikrotik.com

ether1 work. pppoe did not drop.
it is freezing about 2 minutes. then work well. After “freez” upnp port forvarding is clear.
Will try o catch “support file”.

will wait for the support output file.