Guided access not shutting off

Hi there, my daughter uses a speech generating app called TouchChat. I updated her iPad with the iOS 15 last week and now her iPad will not turn off automatically. Before, it was set to turn off after two minutes after any inactivity. Now, after the update, it just stays on forever which obviously drains the battery rapidly. Not only is this super inconvenient and frustrating, but it is a HUGE safety concern. My daughter uses this as her sole mode of communication. If the battery drains and she is unable to use it, she is unable to ask for help, request basic needs, etc. I belong to a special needs group and other parents have experienced the same thing after they did the iOS 15 update. Apple needs to fix this ASAP on behalf of the safety of the special needs community.