Help: Email Config running out occasionally

[AhGu]

I have three pop accounts. All were configured correctly. Able to download emails through wifi, through my home network, sync with desktop,..., etc. No problem at all.

However, occasionally I will receive error messages that I cannot download emails. I checked all config settings. Everything was fine. To solve the problem, I deleted the account on my x50v, re-entered all the settings, and everything would be back to normal.

Anyone has any idea what's wrong?