Internet poops from tp link re200?

I have the tp link re200 Wi-Fi repeater, and I wanted to ask why the Wi-Fi just hangs up every now and then (I'm still connected) e.g. When I'm in Minecraft I stop for the others and in 10 seconds can I continue ( my Fritz! Box is up to date)

First of all, because it is important: The RE200 is available in five different hardware versions (V1, V2, V3, V4, V5), please pay close attention and do not confuse them! Also do not confuse the EU, USA or China versions.

The first thing I would do is check the Tp-Link support page to see if there's a current firmware (~ like an update) for your RE200 (make sure you have the right version and the country USA, EU,!): https://www.tp-link.com/de/support/download/re200/

and check whether you already have the current version.

Here is the configuration page of your repeater: http://tplinkrepeater.net/

If not up to date, I would import the latest firmware, explained here:

https://www.tp-link.com/de/support/faq/2487/

And after the firmware update, be sure to do the factory reset and set it up completely fresh.

Otherwise I would recommend the following for stability:

Different SSIDs in the router and also in the repeater (you have four Wi-Fi networks anyway, but can then be differentiated)
Fixed different WLAN channels for each SSID's different, i.e. For 2.4 GHz 1,6,11 (no intermediate channels!) And at 5 GHz 36 to 48 (they are without DFS).
Manually assign a fixed IP address to the repeater (outside the assignment range of the DHCP in the router, e.g. IP 192.168.178.254, gateway 192.168.178.1, subnet mask 255.255.255.0) explained here: https://www.tp-link.com/de/support/faq/1831/

All WLAN encryption should only be set to WPA2 (only!), No mixed operation!
If there's still a problem, set the bandwidth from 2.4 GHz to 20 MHz (is more stable with strong WLAN competition)