In 2021 my ISP installed the internet service using a router called aircube or something like that. Do stream from it was a small 8 port to link switch and 4 decos. Last year they changed the aircube for a to link AX1500 and everything was fine until a few weeks ago when my deco network started failing. It would stop giving its wireless clients internet and the lights on top of the decks started blinking red. I would somehow restart the decos, the tplink switch and/or the ax1500 and it would all start working again. 
 

5 days ago or so the deco network stopped working again, I've reset everything multiple times and nothing works. 
 

what I've tried:

1. I've unplugged all other decos and worked only with the main unit. 
2. The main deco starts orange and then blinks blue waiting for a connection. 
3. The ax1500 has internet because if I connect directly to it I have web access. The ax1500 also serves the tplink switch. 
4. The tplink also has internet because aside from serving the decos it serves a few other devices directly such as a PlayStation amd those have web access. The problem seems to be with the main deco that simply doesn't get web access. I can connect to its network but have no web access. The deco app shows the m5 as not being connected. 

any suggestions pls