At my country house (not to strong signal) I had prevoiusly a MR200 with basic external antenna Diablo, on the roof.
(Diablo 7dBi MiMo SMA)
The connection was not great but ok. Then a rainy day lightnings took out the electricity in the house and broke all equipment in one of my outlets, including the MR200.
I bought a new MR600 but got worse connection speed then before and it felt like the router was going offline to online all the time. I've now upgraded the antenna to a kick ass Poynting Xpol (Poynting XPOL 5G LTE MIMO 11dBi 698-3800 MHz) that I placed 2meters up on the roof in the direction my broadband provider told me but the signal/speed was only slightly improved and the offline/online problem remains. I only have/use 3G connection. No 4G mobile tower nearby. Measuring the speed (when the router is online) I get ~3.5Mbit upload /14.5Mbit download.
I often get problems connecting to the router via the Tether App on my Iphone. I have not used the Web GUI so far.
I've upgraded the firmware on the MR600 with no improvement.
Any Ideas? Feels like I bought top of the line stuff but only got problems in return...