Players logging in dead

Have had 3 or 4 reports in the last week of players logging in dead after logging off inside their bases. The death screen indicated that they had killed themselves.

Again today there was a player who had woken up dead with seemingly no explanation, a little while later his team mate had logged on and he too was dead, they have bases very close to each other but they are nowhere near any monuments, they didnt tp back from a safe zone before logging out and they were not seated while logging. One of the players very astutely mentioned there was a metro tunnel underground and after checking I found they were both built right above an area where dwellers and loot spawn. I believe this could explain why they are logging in dead.