Hi @Bengt-in-SoFo,
Welcome to the community,
I am sorry to hear about this issue.
In this case, you may be best to backup the handset and run through a software repair on the device as it sounds the update may not have installed correctly on the device.
Here are some instructions on how to backup and how to perform the software repair.
backup using Xperia Companion
software repair using PC Companion
Please let me know how you get on.
