I have a Samsung Edge phone Android why do I keep going offline how can I get like those back online

I have a Samsung Edge 7 Edge phone keeps going offline how can I get it back online can someone please help me I don't know how to do it

What do you mean by 'getting offline'? Is your airplane mode activating itself or radios being disabled? Have you checked to see if you don't have any battery savers or any battery saving settings active that might be doing that?