Thanks for following up. A few more questions here:
- Have you recently received an update on your iOS device? What version of iOS is your iPhone running?
- When did you first notice this issue occurring?
- What version/build of software does your TV currently have installed in Settings>System>About?
- Have you tried renaming your iOS hotspot's network name to something simpler, removing any special characters?
- Are you able to successfully connect the TV to a different wireless network?