I recently updated my firmware in my Deco M4 to 1.5.5 and after that, many times during the day, deco loses connection (Flashing red light or simply freezing). I need to restart deco after every episode of this. As I have more than one deco, if I change for one containing a previous firmware, the network works normally.
But here comes the problem: all the M4 I have already been updated to the problematic firmware, leaving only the DECO E4 working fine, but that can not provide all the bandwidth that I contracted. How to solve this problem?

My configuration is ACCESS POINT MODE, using 3 Deco M4 (I also have 3 DECO E4 1.0 using firmware 1.5.4 and if I change to them, all works fine)