[GAMEPLAY] BUG Coulnd't Auto Attack!

I was playing the rift a while ago as Darius . I was farming well until I started poking the enemy Mundo with auto attacks. When I retreat back to farm I realised that I couldn't auto attack the minions nor Mundo. I tried auto attacking the minions again but it would just move my champ to where the cuorser is. I realised that I couldn't lane so I pinged for help. When I retried to auto attack again this time it worked. But when I start to duo against Mundo , the bug returned. I haven't recalled at this point knowing ill lose some xp so I ping for help. Again the bug dissapeared. I assume that pinging would take away the auto attacking bug.So to clarify, I attacked Mundo and auto attacked on anything triggering the bug, then I pinged which fixed the bug. I tried this method a two more times to verify this case. I hope that the bug won't return and be fixed if found.