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I haven't upgraded any M-Series to 184.108.40.206 yet, I moved to the 220.127.116.11 release when it came out, but it was retracted a couple of weeks later, so I'll wait until this one is out 4 - 6 weeks with out major issues before upgrading to .27.
There is an issue with upgrading from some previous versions to 18.104.22.168, review this before you upgrade.
The 22.214.171.124 M-Series release notes state that they have fixed a few of the issues with sensors going to bad health, auto-recovering and rebooting, but the known issues list still has an issue that cause them to auto recover "In rare scenarios".
We have had to stop running some of our M-series sensors in in-line mode for the same reasons you list above, they kept causing network outages and making us very unpopular.
I do not have M-8000XC in my environment, however, with any upgrade, it is best to test this in a non production environment as well as weigh the risks vs the rewards.
My recommendation, if you are worried about this having issues, wait a few weeks and let others test it for you. Then contact support and ask them if anyone has reported issues with 126.96.36.199.