Why is my phone loosing network

Den43 wrote: "No"

So it's not the original battery — was it changed by a qualified technician using a genuine iPhone battery?...

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

And, again, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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Den43 wrote: "100"

So the battery's Maximum Capacity is 100%. And, again, was it changed by a qualified technician using a genuine iPhone battery?...

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

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Den ~ Does your iPhone 6s still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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