@Solla-topee Thanks. It isn't a huge issue as I can use the lower channels it just seems very strange.

@Haucks I guess you could try setting the 5Ghz channel manually on the router to 36 in case it was something to do with DFS channels. I know a router that is on certain DFS channels can delay...

@Solla-topee Unfortunately I am unable to try any channels above 128 as for some reason my router doesn't list them. I am using an ISP (Spark) branded Huawei HG695b ac router with 20/40/80MHz channel...

@Joshua7 How is your signal strength? I use a free windows store app Wifi Analyzer https://www.microsoft.com/en-us/p/wifi-analyzer/9nblggh33n0n#activetab=pivot:overviewtab to see the signal in dB....

@Solla-topee I got the following reply from Tp-Link Technical Support: "T5E does not support 5G channels over 100 when the chip is manufactured, so it will lead to the situation you mentioned. I...

@Tekaham It uses the Atheros AR9287 chipset so I think Windows 10 should automatically have a driver for it.