it could be the one. if the chassis has not been worked on before, it's probably a good idea to replace all the capacitors. as they get old, they lose their ability to store and deliver power properly, causing all sorts of issues.
these capacitors could be several years old now... good name brand capacitors (nichicon, panasonic, etc) have a lifetime of a few thousand HOURS. (about 5000) these off brand capacitors (hitano, capxon, etc) would likely be way less than that.
I recommend replacing all the "big" capacitors like the large low voltage 1000/1500/2200uF sized caps and the high voltage capacitors (100/200/250 volt) with new capacitors. I wouldn't worry about the smaller 1/10 uf that are under 50 volts, they are probably still okay.
after you change them, i feel much of the issues you are seeing will be considerably reduced.