I haven't had this problem. Is it any app or specific apps? If it's a specific app you could try looking for an update on Play, if it's all apps if I were you I would re-download and reinstall ICS. It is a hassle but you could have a corrupt system file on there that's causing the issue and a fresh re-download would ensure your ICS upgrade software isn't corrupted.
Aside from this, The Register is reporting ViewSonic is pulling out of the tablet market: http://www.channelregister.co.uk/2012/10/01/viewsonic_quits_consumer_tabs/
I reckon this means ICS will be the last official update for this device.
thanks laptopu for the reply i have tried a new download and installation twice, the problems seems to be when i hold the tablet, when its sat on a stable surface i dont get the problem, and i noticed its not closing apps it seems to go back like you are pressing the back button and its not just apps if i open settings etc it does the same.. is there a built in gesture or something that does this maybe i need to turn it off,, its the only think i can think of