Hey Simpl3mom, sorry to hear that happened. Buildings around the area should not be blocking your drone from collecting DNA.
Our staff would like to investigate this, so if it happens again, could you please take a screenshot of it and email it to our staff? You can reach them by email here at firstname.lastname@example.org, please also include your support key in the email.
In the meantime, could you please make sure that you’re in an area with a strong signal while playing the game? Having a stable connection when looking for dinosaurs might help with this issue. You can also try turning your data off and on to refresh the connection, or if you’re connected to WiFi try forgetting and reconnecting to it.