I’m experiencing the same kind of HyperSpeed input reliability issue with a new Razer Joro.
My setup:
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Razer Joro
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Joro firmware: v1.03.00_r1
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DeathAdder V2 X HyperSpeed + shared multi-device dongle
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DeathAdder/dongle firmware: v1.02.00_r3
The keyboard intermittently misses individual key presses completely when connected over 2.4 GHz HyperSpeed. There is no specific key or typing pattern involved — even something as simple as Ctrl+C can occasionally fail because one of the key presses is not registered.
The issue is reproducible on both Windows and Ubuntu, so it does not appear to be related to Windows or Synapse.
Wired mode works normally. I’m actually using the keyboard wired now because I don’t consider the 2.4 GHz connection reliable enough.
The keyboard is only 4 days old, fully charged, and the dongle is connected directly to a USB port on my Razer Blade with no hub involved.
I reported this to Razer Support as case #260815-000033.
Since Joro + DeathAdder V2 X multi-device HyperSpeed is an officially supported configuration, this looks much more like a Joro / HyperSpeed firmware or wireless reliability issue than an OS-specific problem.
Would be interested to know how many other Joro owners can reproduce missed inputs over 2.4 GHz.