These troubleshooting steps have worked for some users:
1. Check power saving mode - ensure the feature is disabled.
2. Clear data and cache memory of play store app (and google play services) from your phone then restart it. Check Play Store to see if issue persists.
3. If yes, change the resolution to FHD (1920x1080) then repeat step 2 (clear cache) and restart the phone. Check the Play store.