cannot write a reminder on iphone 6s
unable to add a reminder worked fine for awhile. type two letters of reminder and it goes to home screen. rebooted no good.
iPhone 6s, iOS 9.0.2
WWhat type of reboot did you do.
IT may not fix it but press the home button and power button simultaneously until you see the apple logo then rellease both buttons.
its like shutting down your computer and restarting. This process will do more than just pressing the power button until the slider appears to power off
IF you tried the above, also try turning off reminder in iCloud, rebooting then turn back on
if still, suggest backing up to computer or cloud, be sure the backup completes. Then reinstall the the operating system by plugging into computer, and selecting the restore option in iTunes. After that's complete restore from backUp.
IF any of these processes are new you or you need further instructions please ask.