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3208 DONT GIVE POWER EVEN IF THE SP IS 50 DEG C ABOVE THE PV

i have sytem with 3504 and two 3208.
the two 3208 dont give power even if the sp is 40-50 deg c above the pv (the sp is about 1000c) only when the sp if more then 50 deg c from the pv it start to give power slowly.
if we close the power to the 3208 and on again it work with no problem.
we try to change the pid but it didnt change anithing.
another problem with the 3504: above 1000c the pv value change to 5 deg less when the heat is on to the furnace ,when we close the heat the the pv jump back 5 deg c , when we disconnected the ground from the 3504 the problem gone.
please help with the two problems
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