Would it be possible for you to post a Speccy snapshot? Instructions will follow.
The T(case) spec for an i7-6th gen is 71 degrees C, so what you describe is running in the hot end of the range for this processor. If you do not have a dusty machine interior, the heat sink for the CPU is not clotted with dust, or similar, I'd suspect something that I almost never do: Thermal paste failure.
As to CMOS, are you saying that if you turn the machine off, and unplug it for a short while, that when you fire it up all the date-time settings are lost in BIOS/UEFI? They should be if you have no functioning CMOS battery.
Using Piriform’s Speccy to Collect Your Computer’s Hardware & Software Specifications
1. Go to the Piriform Speccy Download Page
and download the program.
2. Run the installer you’ve just downloaded.
a. Note: The Speccy free installer may now come with Avast and the Google Chrome browser bundled with it (or something else, what’s bundled has changed over time). Make sure that you UNCHECK the options to install any bundled software when you see the checkboxes during the Speccy install sequence.
When you reach the end, uncheck the View Release Notes
checkbox, then activate the Run Speccy
You will then be presented the Speccy Main Window:
3. From the File Menu, activate the “Publish Snapshot” item [or press ALT+F,B]:
4. You will now be presented with the Publish Snapshot Dialog:
You will, of course, activate the Yes
5. Finally, you will be presented with the Snapshot URL Dialog:
on which you will activate the Copy to Clipboard
button so that you will have the snapshot web address to paste into your message.
If you want to save your system specs to a text file, at step 3 choose the Save as Text File option at step 3. This can be handy if you need to e-mail your specs.