mailnag can't connect after resuming from suspend

[cipman]

$ lsb_release -d

• Description: Linux Mint 20.3

$ dpkg -l | grep mailnag

 ii  mailnag                                     2.2.0-0~ubuntu20.04.1 
 ii  mailnag-goa-plugin                          2.0.0-1~ubuntu20.04.1 

I have only one gmail account set up through gnome online accouns.

$ cat ~/.config/mailnag/mailnag.cfg

[core]
poll_interval = 10
imap_idle_timeout = 10
mailbox_seen_flags = 1
autostart = 1
connectivity_test = auto
enabled_plugins = goaplugin, libnotifyplugin, soundplugin
[libnotifyplugin]
notification_mode = 3
max_visible_mails = 10
[soundplugin]
soundfile = mailnag.ogg
[spamfilterplugin]
filter_text = newsletter, viagra
[userscriptplugin]
script_file =

After resuming from suspend: $ journalctl -e -b _COMM=mailnag

iun 10 08:06:51 i5 mailnag[2053]: ERROR (2022-06-10 08:06:51): Idle callback for account 'myaccount' returned an error (<class 'Mailnag.common.imaplib2.IMAP4.abort'> - socket error: <class 'ConnectionResetError'> - [E>
iun 10 08:06:51 i5 mailnag[2053]: INFO (2022-06-10 08:06:51): Resetting connection for account 'myaccount'
iun 10 08:06:51 i5 mailnag[2053]: INFO (2022-06-10 08:06:51): Idler thread for account 'myaccount' has been disconnected
iun 10 08:06:51 i5 mailnag[2053]: INFO (2022-06-10 08:06:51): Trying to reconnect Idler thread for account 'myaccount'.
iun 10 08:06:52 i5 mailnag[2053]: ERROR (2022-06-10 08:06:52): Failed to reconnect Idler thread for account 'myaccount' (b'[AUTHENTICATIONFAILED] Invalid credentials (Failure)').
iun 10 08:06:52 i5 mailnag[2053]: INFO (2022-06-10 08:06:52): Trying to reconnect Idler thread for account 'myaccount' in 5 minutes
iun 10 08:11:52 i5 mailnag[2053]: INFO (2022-06-10 08:11:52): Trying to reconnect Idler thread for account 'myaccount'.
iun 10 08:11:54 i5 mailnag[2053]: ERROR (2022-06-10 08:11:54): Failed to reconnect Idler thread for account 'myaccount' (b'[AUTHENTICATIONFAILED] Invalid credentials (Failure)').
iun 10 08:11:54 i5 mailnag[2053]: INFO (2022-06-10 08:11:54): Trying to reconnect Idler thread for account 'myaccount' in 5 minutes
iun 10 08:16:54 i5 mailnag[2053]: INFO (2022-06-10 08:16:54): Trying to reconnect Idler thread for account 'myaccount'.
iun 10 08:16:56 i5 mailnag[2053]: ERROR (2022-06-10 08:16:56): Failed to reconnect Idler thread for account 'myaccount' (b'[AUTHENTICATIONFAILED] Invalid credentials (Failure)').
iun 10 08:16:56 i5 mailnag[2053]: INFO (2022-06-10 08:16:56): Trying to reconnect Idler thread for account 'myaccount' in 5 minutes
etc.

After 'Configure Mailnag' (nothing altered) seems to run ok till next resume from suspend: $ journalctl -e -b _COMM=mailnag

iun 10 09:42:52 i5 mailnag[2053]: INFO (2022-06-10 09:42:52): Shutting down...
iun 10 09:42:52 i5 mailnag[2053]: INFO (2022-06-10 09:42:52): Idler closed
iun 10 09:42:52 i5 mailnag[2053]: INFO (2022-06-10 09:42:52): Plugins disabled successfully.
iun 10 09:42:54 i5 mailnag[137748]: INFO (2022-06-10 09:42:54): Successfully enabled plugin 'libnotifyplugin'.
iun 10 09:42:54 i5 mailnag[137748]: INFO (2022-06-10 09:42:54): Successfully enabled plugin 'soundplugin'.
iun 10 09:42:54 i5 mailnag[137748]: INFO (2022-06-10 09:42:54): Successfully enabled plugin 'goaplugin'.
iun 10 09:42:54 i5 mailnag[137748]: INFO (2022-06-10 09:42:54): Checking 1 email account(s).
iun 10 09:44:19 i5 mailnag[137748]: INFO (2022-06-10 09:44:19): Checking 1 email account(s).