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{{unreferenced|section|date=December 2022}}
The Plus/4 also suffered serious reliability problems due to the all-in-one TED chip, which was one of the first ICs MOS developed afterusing Commodorethe switchednewer, fromlower NMOS to the newerpower HMOS process. andMOS had notconsiderable fullydifficulty workedgetting outit allto thework manufacturing glitches with HMOS fabrication. Having sound, graphics,reliably and I/O performed by a single IC resulted in the TED generating too much heatchips and destroying itself. A [[heat sink]] must be attached to the chip to prevent this from happening. The 85017501 CPU, also made with HMOS,consequently had reliability issues as well, especiallya earlyhigh productionfailure unitsrate. Autofire-capable joysticks and improperly constructed 9-pin adapters have also been blamed for damaging TED chips. The C16 had fewer reliability problems than the Plus/4 due to a simpler design with fewer ICs and lower heat output, as well as more room inside the case for heat to disperse.
Like with the C64, the Plus/4 also used an unreliable power supply that was prone to overheating and damaging components in the machine.
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