Find dont exclude folder

[postcd]

in my bash script i have this command:

/bin/nice -n 19 /usr/bin/ionice -c2 -n7 find $wheretosearch -type f -size -800k -mmin -1440 ! -path "*backup*" ! -path "*/sys/*" ! -path "*/usr*" ! -path "*/proc/*" ! -path "*/task/*" -exec grep -l "$phrasse" {} \; >> $outputfile

as you see im trying to exclude folders like "proc" and "task" from the search, but when i execute script, it returns things like:

find: /vz/root/240/proc/15889/task/15976: No such file or directory
find: /vz/root/240/proc/15889/task/16070: No such file or directory
find: /vz/root/240/proc/15889/task/16092: No such file or directory
find: /vz/root/240/proc/15889/task/16105: No such file or directory
find: /vz/root/1140/proc/1/task/1: No such file or directory
find: /vz/root/1140/proc/1170/task/1170: No such file or directory
find: /vz/root/1140/proc/1437/task/1437: No such file or directory

But when i exclude "sys" folder same way as proc, it woks to be excluded, but proc still showup

so im asking what is wrong on that command? thx