ive been holding my radar for over a week now trying to get cliff to show up and he just wont

i think im close to 20 balloons now and all i get is arlo or sierra. how is this happening? my friend is also having the same problem he gets the same leader for days in a row but its never been this bad for either of us. hes also not showing up at any rocket stops and ive gone to 3 or 4