Web UI password fails for WS-C3650-48PQ running IOS XE 16.6.1

[BeachJoe]

I'm having a problem with the Web UI on one of our WS-C3650-48PQ switches.  The software version it's running is 16.6.1 and I've made sure the ip http settings are identical to another WS-C3650-48PQ we have that's running 16.3.5b (newer and hasn't been upgraded yet to the latest recommended firmware).

On the newer switch, I can login every time to the Web UI, no issues, but for the older one running 16.6.1, I am only able to get it to login once, then the password fails after that.

Both are set to be logged in with the same credentials, and ip http settings are the same, but one I can login with, the other I cannot...

My manager wants the web UI to be accessible so those in our department that aren't comfy with the CLI can monitor things with the GUI, but I cannot seem to get the thing to stay accessible on the newer firmware..  Is this going to be a problem with that particular firmware, or is there some other reason the credentials would fail after they succeeded before?

[BeachJoe]

Quick update:

Interestingly, I tried just a few seconds ago and it worked again... this thing makes no sense why it would only work on occasion...  I'm not typing the password wrong either, in fact even if I cheat and copy/paste it, it does the same thing, sometimes it works, but most of the time it doesn't.

[BeachJoe]

One more update:

I'm not terribly worried about getting this fixed, because I'm good with SSH sessions being my primary portal into this thing, but I'll try to check back on occasion if anyone seems to have similar issues or has in the past and knows what might be the cause.

I'm assuming it's just a bug though, but I wasn't able to find any documentation on this firmware related to this issue.