Can I locate "memory leaks" to keep apps from crashing?

Hello clever people,
Since the iPhone 4s is still on the market, I assume that my 2 year old 4s should be able to work fine. However, I am constantly plagued by apps crashing and, most frustratingly, apps often fail to remain running in the background, even with one or no other apps running.
I had a similar issue with my iPad2, just before it ran out of applecare, and the chap had me run through with sending anaylitcs to him, and his conclusion was that a few apps were causing 'memory leaks' - had me reset the iPad and reinstall everything. So I also did this on the iPhone, which did help, but it has not solved the issue. I have also removed most apps from the device, in a bid to locate the offending app.
Searching on Google for "memory leak" only brings up info for developers, and nothing for someone who is actually using their phone and having issues. My usual scenario is going for a bike ride and running Strava, which then cuts out when I stop to take a picture - with no other apps running.
Does anyone know how to solve the issue - return the phone to its 'as new' state, or locate the problem and remove it?
Cheers,
Tobias

There are differenty types of, "resets" ..
Have you tried the folloiwng ??
Reset the device:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, tap Settings > General > Reset > Reset All Settings
No data is lost due to a reset.
Use iTunes to restore your iOS device to factory settings

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Can I locate "memory leaks" to keep apps from crashing?

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