Believe one of the issues causing the problem is switching game modes, for example playing Manager Career mode, then Kick Off, or Player Career. As mentioned before, never play online matches, or even connected to EA servers, unsure on the effect of those modes. Because of the numerous Title Update releases, often requiring a career mode restart to apply changes, and I do not care about preserving Profile statistics (matches played, winning percentage, etc.), what I do is go to the Profile tab in main game menu, delete all files (squad update, settings, career mode saves, and DLC), then restart the game. This will reset back to initial download when game was purchased. Upon restart, the majority of settings stored in the cloud will apply, leaving only camera and slider settings at their default (go though all settings to verify, may be outliers from your preferences, although rare). Next, set the sliders in the main menu, then download the latest squad update (just click on 'New Manager Career'). Exit the game to console dashboard and restart, this time cancel the 'Connecting to EA Servers', then start a new career mode save. Adjust sliders in the career mode setup screens, before advancing to the first day of the career, and after saving, exit to the main menu and redo the CPU behavior sliders for the second time to match the career mode CPU Behavior sliders (gameplay sliders should remain unchanged).
For now, you can attempt what you mentioned in your post, however, skip the Kick Off test, just recheck sliders in the pre-match menu, before starting your next match. There is rumored to be a large Title Update release this Thursday (10/31) and squad update in the afternoon, comprising Portman Road stadium, a number of third kits, updated Saudi kits, and addition of new face scans. Perhaps on Friday, you could perform the partial clean install mentioned earlier in this post for the best results. Only need to delete the files, not unistall and reinstall the game. Need to restart a career mode anyway for some kits, face scans, and updated player ratings to apply; do not remember if added stadiums apply to ongoing career mode saves or not.