@mahm_Cheri
may be it will help you
Do some of this
1. Update your system
2. In playstore go to setting--->network preference and select auto in every option
3. Press for while in playstore one option will show up (app info) go to storage ---> clear cache
4. In playstore app click on your profile click setting---> about ------> Play Store version ( update it if not )
5. Go to Setting and search reset wifi , mobile and Bluetooth and then click on (1) rest wifi and Bluetooth option
* If in the above don't work then download the older version of this in browser or Google *
Sorry I tried to explain with my broken English hope you understand the steps if not then message me I will try to explain better