Hot Keys to switch tabs intermittently stop working (Apple-Option-[)

I've been used to using Apple/Command + Shift + [ to go to next and previous tabs for ages. I used to use Apple + Shift + Arrow keys, but when Safari made the brackets the new default, I figured I'd update.
I seem to keep having an issue multiple times a day where Safari stops responding to the Apple + Shift + Bracket shortcuts. When this happens, Ctrl + Tab still works, and I just discovered that Apple + Shift + Left/Right Arrows also still work.
I can't seem to trace the moment where they stop working, or when they return. Restarting the browser doesn't seem to help. Nor does sleeping and re-awaking, although a restart does. However, even without a restart, they do eventually come back.
I detest input managers and unsupported plugins, so neither are installed. I have NO keyboard shortcuts configured in SysPrefs. I have no idea what could be the cause. Is anyone else experiencing this?

The Mac inherently keeps all input methods active, such that you could type alternate keys on alternate keyboards.
If you have third party add-ons that might change the way Bluetooth works, those would be the primary suspects.
Be sure all your Drivers are completely up-to-date, and batteries in battery-powered devices are still strong.
Bluetooth uses the same part of the frequency spectrum (but a different modulation technique) as cheap WiFi Routers, baby monitors, and microwave ovens. if you live in a busy apartment building, there may be very high levels of interference.

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