my rc airplane motor wont work but works after a period of time or until i do something?

i replaced the motor and speed control but it still does the same thing what is wrong with it i have the flyzone cessna 182 skylane rtf 2.4 ghz model but it wont work and sometimes it wont work at all the battery is fully charged

If you have a receiver battery check to see if it's fully charged. If your speed control or any other components have a fuse link check & see if they are blown & replace if necessary. If you haven't already check all plugs & see they are in the correct port & the wires have not dislodged from the casing.