Tilemap Collider 2d bumps and walls

So technically there are two questions here, the first is that I have a 2d tilemap collider. I also have a character with a relatively complex polygon collider with a flat surface to move on the collider however sometimes the player gets stuck on invisible 'bumps' that require them to move back and forth to get over them. I also have a problem where when the player touches walls they slide down them very slowly instead of just falling. I've done some searching and lowered friction on the 2d material of the player but this does'nt work. Any help appreciated thanks