signal strength issue

Deadman

Journeyman
recently i purchased tp-link router & was getting proper internet access all over the house.since few days i m not able to connect to internet or the modem itself form the adjacent room where i get strength of 3/5 whereas in the corner most part of
my home i get strength of 1or2/5 but get full speed. tried changing the router & antenna position but problem still continues:-?
 
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