GPS and LTE signals are by nature very inconsistent. They can be affected by the geography, the topography and all elements in the dog's surrounding. Even a cloudy sky can substantially weaken GPS signal.
We got trained to "always have GPS and LTE available" with our cellphones - but our cellphones are huge in size (which means more battery and more antenna space) and we have to recharge them every single day.
The reality is that if your dog escapes - especially if it is in a rural area or in the woods - he will likely walk through areas with very poor coverage, and areas with perfect coverage.
In poor signal situations, GPS tracking devices battery dies very fast. The reason for that is that when they have poor signal most devices (including your cellphone) will just feed more energy to the antenna to "try to get on the network". Did you ever notice how your cellphone tends to heat up after landing on a plane? That's because airport are usually located far from cell towers - so your phone is trying to send a lot of energy to your antenna to get on the network.
The key technological advancement of the Fi Collar is that the software running in the collar itself will detect these situations - and make sure to be very careful about avoiding these death spirals.
The best way to find your dog is for the Fi Collar to stay alive and preserve energy until your dog walks in a good signal area.
The Fi team is here to help you in these difficult situations! We do understand that having your dog on the loose and not getting a location can feel very frustration. But rest assured that while your pup is taking a stroll in the woods, your Fi Collar is just monitoring the network and making sure that as soon as it gets clear shot at the sky it can send your pup's location for reporting.