no accelarator responce after start

[Konstantin]

Hello, I recently noticed that sometimes my engine would stay in idle and not respond to accelerator pedal right after start for 6-8 seconds. It happens randomly. Sometimes I need to shut engine off for 1 minute and sometimes for 15 min to get this symptom. If I shut off engine and crank it back then accelerator works right away. Is something is failing? Or maybe it is normal and there is some logic in ecm for it? I have no active or inactive faults.