What version do you have? Have you updated to the version? Is it all apps or just specific ones? I have the same issue on an older model especially on my library app.
I think at some point they all become obsolete meaning non-compatible with new updates, etc. I have 4 different models for different uses. It is only the older one that has issues. I don't like web-browsing on them and use a regular PC for that.
Hope that helps.