Well I live out in the country, and slicing the yard, which we've done didn't turn out well. Phones lines (the grounded ones) ran through the middle of the yard. Cable and other things if you have those do that to. If you dig, you run the risk of cutting those completely and maybe not even noticing that you did until those "why isn't this working" moments. And since this plot of land was someone elses land before developed, their phone lines went through the yard too. And that was just bringing a water line from the water main which was only 10' away from where it needed to go. Traversing 60' and who knows what you'll dig up in the process. Do it if you must, but as someone who's had that done, there's a ton of gotcha's in that choice.
IMO it sounds like one of your wireless devices is showing it's age. Replacement is what $40 these days. Versus cable plus digging plus gotcha's plus ..... It's a much sure-er bet (long term) to dig after all is said and done. But man, the road to get there is not as simple as is sounds. Having lived in high construction areas where nobody, even the city knew what was buried where. With cable outages, water main breaks, and other issues that would never have been, had a hole not been dug.