OVer past few days Deco P9 network is dropping all internal connections every few minutes and is completely unreliable. No changes to configuration in place for last 3 months. Any suggestions? How can

I have configured this kit in my houseand then moved the TL-WPA4220 device to my garage. I plug it in and all 3 green lights come on : power, signal over powerline and wifi. I can connect to wifi and

I orderd the 3 pack but I will require one more unit. I cannot find one to buy speeratly. Is this an option?