UCS stop working for a few seconds and then works without issues (CPU load exceeds specified limits)

Hello dears.

I got this weird issue. Several times a day UCS stops working and can´t even access to the management page. after few seconds or minutes it works fine again.
In dashboard I can see this:
image

it is on a proxmox VM, but CPU maximuns are not supperior to 3%
image

VM specs:
image

one time I could see this error message on UCS diagnostics, CPU load exceeds specified limits, but I can´t see where there are CPU limits specified more than on proxmox (not UCS).
Where I should begin to watch to let me know what it is happening?

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