s pen stopped working

hello every one its unfortunately i ve had to ask for help as i ve gone all over the internet for my problem but there seems to be no fix for this
as i ve seen in sum other forums there has been number of people with the same issue

this all happened after i went to sweet rom, was on stock before that, s pen was fine ( i did post in the sweet rom asking anyone else had the same issue) .
soon as i would take the s pen out the phone would crash and restart again . i don't use the s pen much so didn't get around fixing the issue this is about 2 months ago since the problem started .
now i want to sell my phone for the note 5 i thought i better fix this issue .
i thought try another Dr kretan rom to see if the issue got fixed but unfortunately no it didn't, now the s pen menu comes out when pop out the spen , but no writing or hovering .... i cant get back to stock rom ( unroot) cause the firmware update via odi fails (<ID:0/004> hidden.img
<ID:0/004> FAIL!) which is another issue altogether :(
maybe downgrading to kitkat might fix the issue ?

can anyone help me with this issue ( i am pretty certain its a software fault don't think it be hardware as was working fine on the stock rom )

thanks