Hi

I've an N3 installed on a 710 cm frame and with E800 as engines. The weight of the APR is 5 Kg (complete with 2 6S batteries)

The settings are perfect for the first 10 minutes of flight, then for some reason after 10 minutes flight has a great shaking despite having set the bar shake suppression all the way to the left.
Hovering does not manifest problems but as soon as it gives gas, it starts shaking and annoying sound wa-wa-wa-wa-wa to the engines

Have you had the same experiences? .. and how did you solve it?

thank you

A  little more info would help are 4 - 6 - or 8 your configuration, what size batteries are you using (mah)