I have the Deco M4R

for the last 2 weeks 2 of my deco keep disconnecting and constantly showing as offline. My main deco stays online. One of the deco I have disconnect notifications and the amount of messages and space between messages some days is only a few minutes. 
 

it's driving me mad as before the 2 weeks the deco has never given me issues. But now it's making me consider either getting a whole new mesh system via upgrade and spending near £600 or leaving Tp-link and going with another brand. 
 

I downloaded the logs from the deco but not sure really what the issue is.

i did have a warning when I went into the deco app about the Wan and abnornal speeds.

If I uploaded the log please can someone help me?