New DV on the cards ?

HI all , Just woundering if the DV is on the way out . Sometimes my boost is at 0.3bar untill i turn her off and back on and back to full boost and sometimes under load i back of alittle say to about half boost and the DV sometimes chatters BUT not all the time .

I am hoping the 17705 code hasnt come back to get me after i cured it .