Hello everyone, sorry for my bad English. I bought a DS1074Z for about two years now and its out of warranty and i haven't been using much lately. Today after i turned it on, I hooked it up to my function generator, first i thought it was my function generator but after i changed the channel 1 or channel 3 or channel 4, the sine signal is perfectly okay. does anyone ever have any problem like this? I have no idea :/. The channel 2 stills detecting the signal except the trigger is completely fail and the voltage display seems to be jumping all the time.