1. ditch the cheap charger (if you're using one). stick with OEM whenever possible. there's something with the chip that prevents battery explosion and the capacitive touch screens that the cheaper charges seem to be missing.
2. glass cleaners have amonias and other chemicals. avoid glass cleaners of any type and only use alcohol solutions like what comes with some screen protectors or something like invisible glass.
3. dust conducts electricity! if your dust has gotten wet and lodged under your screen or through your speaker, etc., etc., you may have inadvertantly caused an unsaviory environment, causing the "spasm". although this situation is probably pretty unlikely, if you're SPRAYING the phone to clean it, and not the rag, you're going to kill your phone. period.
2. glass cleaners have amonias and other chemicals. avoid glass cleaners of any type and only use alcohol solutions like what comes with some screen protectors or something like invisible glass.
3. dust conducts electricity! if your dust has gotten wet and lodged under your screen or through your speaker, etc., etc., you may have inadvertantly caused an unsaviory environment, causing the "spasm". although this situation is probably pretty unlikely, if you're SPRAYING the phone to clean it, and not the rag, you're going to kill your phone. period.