I’ve had issues with this system since upgrading from Windows 7 Home Premium 64-bit SP1 a few days ago. No system or app crashes, just several random things either not working or stop responding every user session. One or two third-party programs do not work properly after upgrade, but that is to be expected.
Issues appear to be with Windows itself.
See attached:
Yes also nothing serious here but am seeing similar critical events with one or two 3rd. party software.
If it wasn’t for the ‘Reliability Monitor’ I would not be aware of some of them.
Agreed.
Question is, would a clean install address these niggling issues? How does my system compare to other users running an upgrade from Win 7 or 8?
Or, will Microsoft address these issues over time? What has been the usual experience with this? For example, if I click the Start button and select ‘Shut down’ or ‘Restart’ it always reports ‘Windows was not properly shut down’ in RM, but if I use ‘Windows + X’ and perform the same operation, no error is reported. Is it a bug or an actual critical error?
All good questions.
I upgraded via Upgrade channel (MS Updates) from W8.1 64 Bit to W10 and immediately found my boot up time doubled.
I’m thinking/hoping things will square up as the idea of a wipe and Clean install of W10 doesn’t excite me. :-
In any case I won’t/don’t worry as the major upgrade is coming and I’ll see where things stand after that. 
mchain, are all your system drivers Win10 compatible? anything noticeable in Device Manager?
@ schmidthouse,
This may answer your your question:
https://forum.avast.com/index.php?topic=156141.msg1245715#msg1245715
CraigB,
All looks fine inside there. No errors or unknown drivers found. System currently running is a former enterprise model: http://h20566.www2.hp.com/hpsc/swd/public/readIndex?taskId=135&prodNameId=3352968&sp4ts.oid=3352968&ac.admitted=1440194620811.1123376534.199480143&swEnvOID=1093&action=listDriver&swLang=13&prodSeriesId=3352967&cc=us
It’s old, but Win 7 would report, on average, one critical error a month. Same system, different operating system, but this is an upgrade, not a clean install as Win 7 was.