Wifi drop outs and factory resets.

I updated to the V2.1.4.16 and my upload speed dropped by 0.2. I then went back to V2.1.4.10 and my upload speed came back up, everything was good for a week then my wireless Printer and my ethernet connected arlo base station stared to drop every night around 6.00pm and come back around 11.30pm. Both were connected to the Orbi Satellite, satellite showed "good" backhaul and other devices connected worked fine. I have had to go back to latest firmware so these stay connected however my upload speed is down again and now my satellite shows "good " backhaul for around a week then goes to "poor'. I have not changed anything in my set up and no new devices added. I have to reboot Orbi Router and Satellite to get back to "Good " backhaul. I also did the reset (paperclip) after installing the latest firmware on both router and satellite and have done a reset on Satellite since due to backhaul issue. I am in Australia and only have ADSL2 service which is slow at the best of times so losing upload speed isn't great especially as I have the Arlo Pro Camera's and they need more upload speed to work correctly. Why does the new firmware slow upload speed???