I have had a Range Extender TL-WA850RE for almost 2 years.

I never had a problem but suddenly 1 week ago the RE started to work slowlier than usual and sometimes disconnects from the router, or shows on my device that is connected but has no access to internet

Mi router download speed is not good at all but is ok, i have around 8-10 Mbps, i checked with speed test and in the worst case is 7 mbps.

But doing speedtest to the signal on the RE i got 0.5 Mbps, that is very very slow than normal and sometimes i have no connection to internet.

What do i need to do to reset to normal speed from the RE?