Stiff foot/ankle locking?

Hi all, Was wondering if anyone had anything similar to this? My left foot keeps catching/locking? When I’m sat down it will kind of annoy me and I feel like I have to keep moving it (strange I know) then every time I get up that foot locks and then I limp everywhere for quite a long time, like o can’t bend my foot properly? Sometimes it happens randomly when I’m out and can completely prevent me from walking. At night the same foot will completely flop forwards and feels very uncomfortable. The only releif I have is if my husband holds my foot in a 90• angle. Just been bugging me (will tell neuro at next appointment this October) Has anyone else experienced anything similar? Thanks Sam