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Just like any other app, Zotero has its quirks. Here are some, and how you might want to deal with them. At best, these are little annoyances that some people will just have to put up with.
This may happen when you open Zotero:
It has something to do, among others, with Javascript not loading properly. Well, it says restart Zotero! Not exactly troubleshooting. It's just that you wish the trooble to go away.
This means you have synced attachments that are on different folders. This is eventually unavoidable as you work from different computers with Zotero installation.
Non-solution solution: try to be as consistent as possible with your storage space. A cloud-based storage accessible from all computers with your Zotero installation might work.
Of course you have the following option
under Preferences | Files and Folders. But the proviso ““as long as the file structure within the base directory remains the same” is easier said than done, especially as you use different devices with different operating systems (OS).