Perhaps, others, who know far more than moi about connectivity, will chime in with a simple fix.

But FWIW, I would, nonetheless, install the 10.10.4 Combo Updater.

The combo updater(s) are known to fix assorted ills, and AFAIK, never hurt. But whether your connectivity issue is one of them, alas, know not.

Still, me thinks its worth a go-

Should you do it, please post back with your results.

Harv
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)

Those who can make you believe absurdities can make you commit atrocities. ~Voltaire