A few troubleshooting questions

I have a MacBook Pro (retina, 13 inches, early 2015) that is running OS X El Capitan, Version 10.11.4. I really like to use it, but there are a few questions that I have dealt with recently that I would like help troubleshooting.

1. sometimes, I look at Netflix while doing other things on the computer. Sometimes my computer fan will speed up until I have to shut down the computer and let it slowly downwards. Is it normal when there are too many used battery power, or the problem can be corrected?

2. I have an external hard drive WD MyPassport Ultra 1 .5TB, which is set up with my laptop. Lately, I've especially been "Finder" open with it to sort the files it contains. The hard drive seems to work fine, but when I shut down my computer or let it go to sleep with "Finder" open, the following error message appears when I wake up the computer (see image).

However, even when the message appears, none of the clickable options are actually clickable and just show the loading icon. Instead, I have to force quit 'Finder' and when that finally works, the only option is to force eject the hard drive and plug it back in. (then it works fine except when I let the computer go to sleep, and then the process begins again. What should I do? This doesn't seem to be a problem with the external hard drive or with the computer?

3. lately my computer has been freezing, usually if it is not always when the Finder is in use (sorting files). It happens at random times, not always. First the cursor freezes / stops moving, then the trackpad doesn't work anymore (do not click). The only solution I've used restarts the computer, which solves the problem, until it happens again (which could be anywhere from 30 minutes to about 3 days later). How can this be repaired?

4. I also had pop up ads when I'm even not doing anything on the internet (Safari is usually open when he arrives but reduced or hidden). What are these pop-ups? They are bad?

Sorry for the many questions!

Thank you!

< image edited by host to remove personal information >

S/N redacted

Tags: Mac OS & System Software

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