A couple of new problems

I’m on an iPhone 4s, IOS 7. I use Pocket Earth very frequently. At some point in the last few weeks, the app has seriously slowed down. Anything I do in the app results in a 5ish second pause before anything else can be done. If i zoom in, I have to wait to move the map. If I tough an icon, I have to wait. If I move the map, I have to wait. It’s frustratingly sluggish. I’ve tried everything…..closed all apps, rebooted phone, etc. The „Nearby“ search has a bug that appeared about the same time as the above issue. If I search for a gas station with the radius setting at anything (I usually have it at 8km) and hit „show all on map“, it displays thousands of items……..not just gas stations. This is the same for ATMs, Pharmacies or anything else.