So I have a relatively newish Nexus 5X which has been working well, but today at the gym something weird happened... I'm wondering if I should worry about this or just write if off as a once off bit of weirdness. Basically it went like this:

1. When I unlocked the phone the fitbit app was open (I don't recall opening it today at all) and on the fitbit SMS notifications settings page, and android was asking if the fitbit app should be allowed to send SMSs.

2. I clicked "Deny" and then back but had to click back about 5 times to get out of the fitbit app, because it kept navigating "back" to the same SMS notifications page.

3. I locked the phone.

4. When I unlocked the phone again I noticed that the wifi was connected but saying "no internet"

5. I hit the wifi button and it said something like "wifi connection to chromecast 3456 has not internet connection"  - I'm not even sure why it was connected to this wifi network - I've never connected to wifi at all while at the gym or to a chomecast for that matter...

The phone software is up-to-date as far as I know - in fact last night I just got an android update. Any thoughts?