I witnessed that as many times as I had SC in my career. Due to slow pace of the pack tyres and brakes are cooling down, thats obvious but for AI it simply doesn't exist. After green flag they lift off like space rockets with straight away racing speed, they don't worry about tyres temps because I assume it doesn't happen to them. Its simply impossible to keep up with their pace on first lap after restart because tyres have to warm up firstly. Conclusion: Make AI FINALLY behave like real drivers, not like perfect machines.