Hey guys got a question , so my I recently just found out I think one of the bulbs from my Taillights on the left side is burnt out but here’s the weird part I know when it’s out cause when I turn on my left turn signal it flashes a bit faster almost like a beat lol but this afternoon I went to check on it and it disappeared the taillights all work so my question is , is this a common issue or is the bulb really burnt ?

thanks !