I have a canon powershot ELPH 180. After 2 years it started acting strangely. First, it wouldn't take movies unless I held in the movie button. Then it started scrolling through the picture roll when I started it up even though I did not have it set to do that. Then it would start up once, but then after I shut it down it wouldn't start again unless I removed and re-insterted the battery. I bought a new battery which reduced the frequency of the issues, but then it started not turning on again. What finally solved it was that I CRC'd every connection.
Get a can of CRC or similar fast evaporating electronics cleaner online or in the back of your local Walmart with the automotive miracle additives. Turn the camera upside down and spray the CRC into the crack around the On/Off switch and photo actuator buttons. Let it drain and dry for 15 minutes. Then open the battery compartment and remove the SD card and battery. Put the little CRC hose in both and spray a bit while holding it righ side up so those cavities drain. Then spray the metal parts around the battery door, and spray the terminals on the battery and SD card.
Let everything dry for 15 minutes and then put everything back in and start it up.
It was funny, because even after cleaning the camera connections I still had problems with the old battery. But after I CRC'd the connections on the old battery even that worked fine. So apparently these Powershots are very sensitive to even the smallest amount of corrosion on any of the connectors.
Now mine works fine again.