Anyone lost a key or too in last few days, we also had same problem and finally we got it. The portal key limit is 35. After you go over it the first one that you had will vanish! So plan well what keys do you need and drop ones that you don’t need. Also you can drop keys for other players to pick up. Still not confirmed, possible bug in one version of updates, read updates sections>>>
There is some players that already have more than 35 keys, they also tried to drop a key and pick it up, and they still have same amount… Maybe this is bug, we will investigate further!
This is still not confirmed, we force stopped app, cleared all data and updated to 1.08.0 and now we have more than 35 portal keys!