Nova v8 orange wifi doesn't work then freeze.

[naximo]

My nova v8 orange have problems from the last update, sometimes the wifi doesn't work, (no osd advice as active like USB or ethernet).
And always after a few minutes the receiver freeze and i have to unplug because the on/off button don't work and the remote controller doesn't work.
What can I do?
Can anyone help me?
Thanks in advance.