Unfortunately, I can only agree that Teltonika seems to have totally lost control of its RUTX FW quality, and I am really worried with this and consequently at this point I cannot recommend anyone to purchase a Teltonika router because of this FW degradation.
Teltonika HW is nice for the price. FW features on the paper are also nice with even quite clever ones, but so few of them work actually smoothly, e.g. how to use data limit without a working automatic data counter reset...
Last FW7.0 makes just things worse than ever, with terrible freeze in WEBUI, in addition to break some big feature like profiling... Just a nightmare. From my side I didn't experience some specific modem behavior degradation regarding previous FW version on the top of a the general painful WEBUI lagging issue. However I wonder how such kind of huge regression can occur and how does Teltonika test its FW to make such disaster possible.
To Teltonika R&D, please stop to develop any new feature and just try to focus on making work existing ones smoothly and regain FW quality under your control. But as an optimistic person, I am convinced this is likely what is on going regarding the delay to get a new FW version :-) (nevertheless and carefully I also noted that we had to wait for a long time to get this terrible release 7.0...)
From my side I have also downgraded to FW2.5.2, as to be honest, I am a bit tired to take time to report and explain issues I observed since release 6, with up to this point no visible improvement at the end. Really disappointing.