In a Premier Draft today (April 10, 2022 at 11:34 CET = GMT 9.34) I clicked Deck Details in order to quickly check how many artifacts and enchamtments I had drafted. I then had difficulty closing the Deck Details window and get back to my draft. The first time it took several clicks to get back, the second time also, but then I didn't get any packs passed to me, so IU eventually realised I had been disconnected. After I closed and restarted the game, I clicked Deck Details a third time and again it was very sluggish but eventually I got back to the draft, but after I had missed a pick ni the draft.
I run Arena on Windows 10 Home, 64-bit with an Intel Core i7-4790 CPU and 12 GB ram.