youtube data api intermittently throw access forbidden

Question

I need to upload considerable amount of videos on YouTube, so I have a c# application, upload one file each 5 minutes. The problems is, it intermittently throw "access forbidden". For example it worked for around 4 hours this morning, then it became moody again :D. Any same experience recently with YouTube API?

It's the error I receive sometimes, but not always, after successful authentication, when it tries to upload:

Google.Apis.Requests.RequestError
Access forbidden. The request may not be properly authorized. [403]
Errors [
    Message[Access forbidden. The request may not be properly authorized.] Location[ - ] Reason[forbidden] Domain[youtube.common]
]

Cheers

Answer 1

Waitting for answers