It's not uncommon to get those symptoms, and nor is it uncommon for them to temporarily go when you turn it back on.

You do need to get the fault codes read as they'll help narrow down the options - There will be a code, or codes stored if the light has flashed. It doesn't need to remain on for the code to be stored. Could be any number of issues - the Inlet metering valve, fuel pressure sensor, pump, injectors...