If anyone wondering I noticed some of my accounts have common stuffs happen to them before they get banned.
There are two kinds of Failed to Sync on Battle result which
- one you will be kicked on title page means your internet probably disconnected you on the middle of the battle
- other one is you will just going to be brought on the home screen which is weird. Since it means you are still connected on your account yet they kick you for failing to sync on battle means that you are flagged now for suspicious battle result. This wont cause any ban yet if it happens to you but any battle you will be done are mostlikely gonna get investigated and see if its possible with the team you have to do the damage they show. It lessen the people to check.
So if ever this happens to you consider yourself flagged already by the system and you are already on their list to be investigated with the reason why the battle sync dont work yet you are still connected on the internet since you didnt go back on login screen.