Adapter constantly switches to N

I have to assume you are using two different SSIDs for the two different standards - delete the network entry for the "n" SSID and the computer will be unable to connect to it. You may find at that point that what happens is you periodically loose your connection to the "ac" network - which would then reveal the true cause of the "switching" - a poor quality signal on the "ac" network. I think it's time for the industry to recognize that each successive step brings additional complexity and that the users in general (not specifically you) will need to know more about the technology in order to make it function - it may also be time for the users to recognize that they have to learn more about the technology or call a professional. 802.11ac is a 5GHz only standard and as such subject to the increased attenuation of the higher frequency band - it simply does not penetrate walls and furniture to the same extent as a 2.4 GHz signal would - 802.11n is a dual band standard, and supports both 2.4 & 5 GHz.

I have to assume you are using two different SSIDs for the two different standards

*facepalm* no, I'm not. I didn't even know that was possible.

I also wasn't aware that n supported 5GHz, guess you're correct, I do need to edumacate myself a little more on the standards. One glaring question that leaps to mind is why ac is considered "better" than n if they both support 5GHz?

ac allows higher theoretical throughput. Tell me - if you're not using different SSIDs, how do you know whether you're connected to n or ac?

The a6200 has an LED on the side that glows orange for n and blue for ac.

Ironically I've just got home from work and the adapter is showing as blue, meaning it has been connected to the ac network all day without switching or dropping...hmmm

Depending on your network router and AP’s you can run multiple bands on the same SSID. The A6200 has a ‘band preference’ setting to ‘prefer a.’ This will tell the card to connect at the higher rate if available. If you have multi AP’s you may also want to set the ‘roaming tendency’ to ‘moderate.’ Windows and the A6200 will sometimes continual search for the best connection every few seconds. If the card decides to roam because it things the other AP is better, your connection will be paused as it re-authenticates/reconnects, resulting in an overall slow response to the user. Removing the option to make bad decisions improves performance. It will need roaming ability if an AP fails, but these settings do not exclude roaming, it should only reduce it.