Samsung S7 Edge slow on certain wifi networks (ipv6 is disabled)

I love this phone but have no idea why this is happening.

I have a Asus RT-AC87U router broadcasting on 2.4 and 5Ghz. On this network my phone works great!

I bought a TP-Link range extender RE450 for better wifi on my balcony(a good one according to reviews). When I connect my laptop to the ssid of the TP-Link I get almost full speeds. When I use my phone on the TP-Link, it just dies. I do a speedtest bandwidth test, it starts going up, stops at around 2Mbps (on a 60Mbps network), crashes down then I get a network connectivity issue. So it's definitely something on the phone.

I tried:
Disabling ipv6 on my asus
Used the 2.4 and 5Ghz with the same results
Changing DNS info (dunno why)
Turning off bluetooth
Google the heck out of it (which led me to do a lot of the above)

Ping test from Mac on TP-Link to Samsung on TP-Link:

PING 192.168.1.125 (192.168.1.125): 56 data bytes
64 bytes from 192.168.1.125: icmp_seq=2 ttl=64 time=50.450 ms
64 bytes from 192.168.1.125: icmp_seq=3 ttl=64 time=383.978 ms
64 bytes from 192.168.1.125: icmp_seq=4 ttl=64 time=49.204 ms
64 bytes from 192.168.1.125: icmp_seq=5 ttl=64 time=22.416 ms
64 bytes from 192.168.1.125: icmp_seq=6 ttl=64 time=217.993 ms
64 bytes from 192.168.1.125: icmp_seq=7 ttl=64 time=17.254 ms

Ping test from Mac on Asus to Samsung on TP-Link:

PING 192.168.1.125 (192.168.1.125): 56 data bytes
64 bytes from 192.168.1.125: icmp_seq=0 ttl=64 time=258.374 ms
64 bytes from 192.168.1.125: icmp_seq=1 ttl=64 time=71.606 ms
64 bytes from 192.168.1.125: icmp_seq=2 ttl=64 time=191.697 ms
64 bytes from 192.168.1.125: icmp_seq=3 ttl=64 time=121.922 ms
64 bytes from 192.168.1.125: icmp_seq=4 ttl=64 time=84.065 ms
64 bytes from 192.168.1.125: icmp_seq=5 ttl=64 time=31.824 ms

Any ideas?

Thanks! :confused:

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