I think this might finally be solved (knock on wood). I uninstalled ALL Dell and Alienware software from my laptop by going to Apps and Features and searching on Dell and Alienware and uninstalling each. I decided to do this after seeing a spike in CPU in Task Manager at the end of one of my "freeze" events -- the process was Dell SupportAssist Remediation or something like that. This was about a week ago or so. I have not experienced the freeze since -- but it was an intermittent problem so we'll see. Also, I was able to get the WiFi stable by turning off Smart Access Point Selection and Network Prioritization Engine in the Killer app. The WiFi hasn't disconnected even once in the last two weeks since I did that.
I have an Alienware m15 several months old and from the get-go, I have had a problem where it intermittently freezes for several seconds. Obviously I only notice this when I am using the computer, and I am usually doing things in Chrome, but it doesn't seem to be related to any particular websites. When it freezes, the mouse does not move, the keyboard is unresponsive, and even CTRL-ALT-DEL does not do anything. After anywhere from 2-10 seconds or so it goes back to normal as if nothing happened. This used to happen at least once per evening I used the computer and I worked with Dell Technical Support to uninstall the Killer networking software and install the latest software from their website. I didn't experience the problem as often but I have noticed twice over the last week or so, so the problem is not gone. All of the diagnostics tests pass, all windows updates, BIOS & drivers, etc are up to date (I check Windows Update, Dell Update, and Intel updates regularly). I don't use any peripherals and I use WiFi. Nothing is plugged into the computer at all, other than the power cord. I have experienced the problem on battery and also when plugged into either of two different official Dell power supplies (one that came with it). I have reached out to DTS again over WhatsApp but when they asked me if I have tried using the computer in Safe Mode I thought it was time to broaden my search for help.
Intermittent freezing for several seconds at a time