REY619
Discoverer
I am having the same problem as OP but with a tp-link c6 ver 2. My setup is like this - airtel nokia router connected in bridge mode to tp-link c80 then connected lan to wan tp-link c6 in ap mode.
I think it started after an update about 2 weeks ago or maybe I just started noticing it since then. Can I RMA this router, what problem will I tell them?
OT- I bought the c80 over the ax1000/1500 based on amazon reviews and am happy with it so far.
You can post at the Official TP-Link support forums as well. Explain them the problem, if they aren't able to resolve they refer the case to the RMA themselves and Indian RMA department will contact you.
Can search through the forums as well, for a similar problem with same model.