iphone and ipad health medications app lose data

We have been using the health medications reminders regularly for more than 4 months and have found it particularly helpful. My partner has memory problems and provided she marks off the medications as she takes them, it’s easy to determine whether the medications app has been taken.

Recently I find. that every 2 to 3 days (no stimulus determined) the app suggests that She start to add the medications as there are none.

At this point I request siri to restart the iphone; after restart - all the details and history are restored from icloud.

Could this be related to the amount of historical logs (some medications are taken hourly) and we have noticed the restart requirement only since IOS 18. what do we need to do differently?

PS it would be great if either ipad or iphone could be used - however this is only possible if the alternative device is restarted prior to use - there appears to be no way of advising the ipad to retrieve the latest data from icloud.

Device is iphone 12 mini 128gb and iphone 12 pro 256gb both on IOS 18.2 also ipad mini and ipad air.