IOS 11.2.6 iphone is deleting some text messages automatically
Hello.
I have an iphone 6s plus, running 11.2.6. & I switch my phone off every evening.
The problem I am seeing is:
I am sent a text message whilst the phone is off.
When I switch the phone back on, the message(s) notification appears on the lock screen.
I enter my passcode to access the phone.
The red new message button is displayed on the messaging app icon.
If I open the app (which seems to take a longer time than normal) there are no new unread message(s).
If I don't open the app, the red new message button disappears.
So the new message which arrived ok and was displayed on the lockscreen is being automatically deleted by the phone. This may be hard to believe but it has happened on 3 occasions recently.
I have tried resetting the network settings but the problem persists.
Otherwise the phone is working normally and when switched on I can send/receive text messages fine.
thanks for any advice.
John
iPhone 6s Plus, iOS 11.2.6