What version of Reflect were you running prior to the update? If it was a 7.1 release, then update notifications only occurred when you launched Reflect interactively. There was no background update checker. That was added for 7.2, so going forward you'll see a system tray icon when a Reflect update is available.
As for Windows Explorer, a similar issue was reported in this thread
and Macrium is investigating, but there's no information on underlying cause yet. Might want to keep an eye on that thread, though. I can't imagine Reflect being responsible for a WiFi problem, though, nor for WiFi performance to differ based on whether a Rescue Media flash drive is connected. And Reflect definitely wouldn't cause Intel drivers to just appear in Windows Update.
In terms of other known issues with the latest version:
- I saw one case where Macrium Image Guardian is reporting as not being installed even though it's actively running, but if you can successfully access the Other Tasks > Macrium Image Guardian Settings interface (or aren't using Image Guardian at all), then that wouldn't affect you. If this does affect you, try an uninstall and reinstall. If that doesn't fix it, Macrium is investigating this one.
- If you use WinPE 5 for your Rescue Media builds, it gets incorrectly identified as WinPE 4 in the Reflect title bar. This is a cosmetic issue.
- If you use WinRE for your Rescue Media builds and are running Windows 10 1809 (you're not), then it looks like there's an issue with automatic driver loading when your Rescue Media first boots, even though those same drivers work just fine if subsequently load them manually. This does not occur on builds that came from Windows 10 1803, so it looks like Microsoft has changed or broken something -- but they've also pulled Windows 10 1809 entirely, so this might get fixed as part of a re-release anyway.