Solution:
There could be several reasons for this issue, and it may be related to incompatibilities with your new hosting environment. The best first step is to contact your hosting provider for clarification.
Possible causes include:
- Missing or disabled PHP extensions
- Insufficient server resources
- A corrupted backup file
Troubleshooting tip:
Try disabling all plugins by renaming the plugins folder to something else (e.g., plugins_old). Then test your site again to see if the problem persists.