After updating i found the quality of 5 ghz has improved but... My 2.4 ghz have severely affected ...

I tried to resetting my router ,rolling back to previous version ...nothing working.. The stability has just gone 

2.4ghz have become very sensitive .. Even dropping one strand of range the bufferblot and speed loss is drastic 

Speed test sometime got stuck / like packets are not receiving .

Hope tplink fix this issue..

Idk maybe its my router only or every_other ones.