I think I read about some other elektron devices (octatrack specifically) having issues when synced to a Mac computer (specifically). like when the computer goes to sleep the device never wakes up and sometimes freaks out, something like that.
I haven’t heard of this with a tablet, but an iPad is not so different from a Mac computer.
So maybe you should contact support and ask if this is related to the same issue that Octatrack suffers from, otherwise try unplugging the USB when not in use? Don’t know what else to suggest, sorry.