Sky Mobile to Sky Mobile Calls Drop At One Side

[chrisjpaterson]

My wife and I are both on Sky Mobile. 70-80% of the time during a call one person will no longer be able to hear the other after a varied time. We then have to hang up and call each other back to hear them again. This has been happening for a while and has continued after changing phones and SIM cards. WhatsApp calls are fine and calls to non Sky Mobile numbers are also fine. When one person can't hear the other they strangely can still hear keypad tones if you press them but no voice. Signal strength and location does not matter. Any suggestions?