Why does my character keep falling through gaps in tiles? [Unity2D]

I’ve been having this problem for really long on my game projects, I’ve looked over the internet for a solution but I never seem to find anything. On some parts of my 2D platformer metroidvania game, I’ve been having this problem with tile grounds were the player when walking on tile grounds seems to fall through between two tiles even when they are closed in together. I still haven’t really managed to think of a accurate idea to fix this problem which is why I’m asking on here. Does anyone know how to fix this problem?

Check the players transform x,z values. Maybe you are moving the player behind the tiles accidently. view the scene in 3d at runtime.
Did you try to rise or lower the collision box of player?
When the player starts falling, pause the game and look at the tile’s collision box. Maybe you are generating too many tiles and system wont be able to calculate collisions.