Hello imBole,
Thank you for using Apple Support Communities!
We understand from your post the time and internet signal are doubling on top of one another. In a situation like this backing up your iPhone and reinstalling the software may help. The following article has the steps on how to backup your iPhone:
How to back up your iPhone, iPad, and iPod touch - Apple Support
By using the steps as listed under the heading "Put your device in recovery mode and set it up again" from the following article you can reinstall the software on your iPhone:
If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support
Best Regards.