Does it do this if you leave a tab open that doesn't auto-refresh? I don't see any reason to leave an auto-refreshing tab open when you aren't viewing it. You could try leaving the home panel open instead. This is probably an extjs5/browser issue not really OMV.
Thanks fou your input.
You're rigth, it is not necessary, and probabbly it woul not be related to OMV.
I didn't thought about it. Will check and report.