Router Randomly Dropping Internet Connection

There is a lot of negative chatter concerning the SB6190.  If possible, you may want to consider a different model?

Having your ISP doing a line check is a great idea.

The Orbi logs (Advanced, Administration, Logs) do log internet connected events when it loses it.  I have noticed that - personally.  If the Orbi restarts however, I find the logs get wiped out. Look at Advanced - Advanced Home - Show Statistics.  What is your Up Time like?  If the Up Time and the Up Time of your WLAN (last 3 rows) are essentially the same, then your Orbi system is relatively stable, short of any internet losses that might be observed in the logs.  The logs may reveal other issues. 

If your Up Time is never more than a few hours, then your Orbi is restarting frequently.  Others here can advise on that better. 

If the Orbi uptime however runs into days, short of the logs revealing something, I would try:

1. Different placements of your Satellites to help ensure device connectivity.

• Do you devices have logs?  Maybe they reveal they are losing wifi connection?

2. Explore different SB6190 options.

• Maybe your ISP will swap it out for something different/better?