I downgraded again and restarted the computer and it fixed everything. I want to let the developers know that you need to optimize the app somehow. I used utorrent before and in my experience utorrent is by far, the most optimized torrent app I have used so far. I had over 400 torrents running on utorrent before and I had no "not responding" issue except for a few times. After they added the mining fiasco, I stopped using it and switched to Deluge and it became not responding after adding over 60 torrents and now using qbittorrent because some private trackers have been banning utorrent without showing any technically detailed proof to support their claim about utorrent leaking passkeys of users to DMCA authorities. I asked in utorrent forum if what the private trackers are claiming are true or not and even utorrent developers did not show any technically detailed proof other than claiming that it is all a hoax. Since no party is showing any proof so I decided to switch to qBittorrent and it has a plus point, qBittorrent can download from private tracker better than utorrent. I tested this on "BitSpyder". I was downloading a torrent via utorrent and it was stuck at connecting to peers but ran the same torrent with qBittorrent and it downloaded just fine. So, I decided to stick with qBittorrent but this habit of being "not responding" is kinda annoying. Please see if there is anyway to fix it in the latest update of the app.
Note: I am currently using 4.2.1 as it is more stable and usable compared to the latest versions.