Okay, so the title might sound weird because I tried to make it short... Let me explain.

I'm a software engineer, working on a media app as my day job, and such, use my Google TV Chromecast dongle not just for my own media consumption, but to test said app. This testing involves geo-locking, for which I need to use a VPN, and I solved this using a travel router that is configured to be a VPN gateway (basically, any device that connects to it is routed through the VPN connection, while the travel router connects to my own WiFi and acts as a repeater - but this is not important right now).

About 90% of the time, I'm connected to my home WiFi. This WiFi was configured automatically during the initial setup process, and works fine, password is remembered between reboots, it is automatically reconnected, and treated as a priority access point. Up until the moment I decide to manually connect to a different AP (in my case, the VPN hotspot). Once I connect to any other WiFi AP, this original AP is completely forgotten (does not appear in the WiFi list as "Saved", and when selected for connection, the password needs to be re-entered). This is the only WiFi configuration that does this, though.

I've tried multiple times to reset the device, to no avail. The first WiFi I connect to, the one you set up when you log in, is always "forgotten" when you connect to another. Any other WiFi AP is properly remembered and does not require the password to be re-entered.

Has anyone encountered this issue before? If yes, did you manage to solve it?