First 4-5 seconds of motion video is heavily pixelated

I have a Stick Up Cam with solar panel (3rd gen).I noticed that for every motion recording, the first 4-5 seconds image is heavily pxielated. After that the video is very clear. If I try Live view, the video quality is good from beginning.It seems the cam needs few seconds to detect proper network speed to send the data.The WIFI signal is RSSI - 51. my internet speed is 100mbps down/40 mbps up.Is there any settings to make the motion video use HD resolution from beginning? Or is this a defect of the product?