I just ran in to this today and I didn’t see a thread on it already…
Apparently there’s an 80 driver limit of v3 hubs. I know cause I just hit it and had to go pull some stuff off
Not sure what you are running but generally this happens when you import all devices from another hub. Selective import can solve this if your integration supports it. I have a hue driver that does selective discovery to get around just this sort of thing. You don’t need every light bulb in your house to be a device.
That’s a lot of drivers, how many devices do you have?
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80 drivers?! I thought I read 80 devices 
I’m curious as well about that number
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Recently I faced same issue, after transfer from smarthings hub station to aeotic hub v2 2025 and all drivers imported after one week I noticed that i can’t add any extra driver because as the message say I reach the 80 driver limitation although the number of imported drivers more than 80, I surprised how it come old hub with smaller ram can handle more drivers?