au bufenter,bufleave does not detect a switch of buffer

Hi,

I have this kind of script :

let g:startTime = reltime()
autocmd BufLeave,BufEnter * call s:FOO("c:/infos.txt")

function! s:FOO(temp_file_name)

echo "Temps écoulé " . reltimestr(reltime(g:startTime))
call s:LeaveAndReEnterBuf()

endfunc

func! s:LeaveAndReEnterBuf()
sleep 100m
echo "Quit and go back to the same buffer"
exec "normal \<C-W>h"
exec "normal \<C-W>l"
endfunc

I would like with s:LeaveAndReEnterBuf to periodically call my s:FOO
func.
But this is not working. Just one time.
Why ?
Thanks

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