If only wireless connection is dropping, you can follow this http://www.tp-link.com/en/faq-722.html

V3 supports remote access via Tether and TP Cloud ID. No plan on V2, I've confirmed with tplink support

Is the WAN IP address in the status page a public or private IP address? It should public IP. If the IP address is not static, you can set up DDNS to bind the WAN IP and a domain together, then you...

The volume name changes but what influence does it have for you to access the drive?

Reboot your router. Confirm your wireless password, when you set up the tplink as repeater, the important thing is to enter the correct password. And you can connect a pc hardwired to the repeater...

If you are looking for a USB wireless adapter, driver needs to be installed. For some adapters, driver will be installed automatically by the windows 10 system, like TL-WN821N V4/5