Another unhappy TMHI user with unexplainable network issues

Another user here with TMHI.  When it works, it is good.  I can average 35-45 down, which is perfectly fine for us.  However, over the past three weeks, the service has been completely unreliable.  I work from home so I am very aware of network issues.  I am a system engineer so I know my network.  I have called into support only to have them tell me the router is connected, which is actually a true statement.  I typically have 3 bars on the Arcadyan and the useless phone app shows the internet is connected.  They have no abiliity or understanding beyond "the router is connected".  I have done their "reset".  I have a PC hard wired to the router.  I run traceroutes.  This is 100% on THMI and they don't have a care in the world about it.  Fortunately for us, we have fiber being laid in our subdivision and will soon be able to have another option for home internet.  I really want TMHI to work as it is a great solution, but they only care about getting sign ups and not actually doing any capacity planning or upgrades to keep the customers they have.  So sad….