K-9 fails to read and send

Hi.
My K9 app had suddenly stopped working. I have made no changes to the settings. My computer browser is running as usual. All my three accounts are not updating.
What can I do to get it running again?
If I uninstall the app, will it forget my used data?
Rgds
Max

Hi,

it is necessary to add more info to get help:
Which exact version of K9? (Not just “latest”)
Which mail provider(s)?
Do you get any error messages?

Depending on whether you are using IMAP or POP the mails might be gone if you re-install K9.

Let’s start with the extra information from your side

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