yes those numbers are averages, the green bar underneath them shows jitters,if it is not a smooth line, maybe take screenshot?
also do it the next time you have problems, these things can occasionally be intermittent due to things like water on incoming line, or wifi jamming from other devices,
also maybe do a ping test to eto, it could be you are hopping through a server that is capped and overlogged
it's hard to identify these probs even for service tech , your best bet is to collect all the data you can for them...... once i had a customer who would push the #5 once on the cable remote, that would cause the equipment to continuously receive 5's over and over,, after multiple service calls of having techs exchanging remotes and tv boxes, and looking at her like she was crazy("cause it only happened at night") , I showed up, she was nearly in tears with fears of ghosts and tricksters , I noticed that she had 2 mirrors face to face at opposite corners of the room, it was causing the remote signal to bounce back and fourth, I advised her to cover one of them up, and for reassurance left her my number.. but she never called back...
I have also seen euro phones jam americ wifi, any time you would pick it off the hook , the wifi would drop..... channel rotation did not fix...
I know these may not be your situations here, but just examples of things you could be facing....