The problem is likely to be a lubrication issue with the co-axial escapement. I`ve no first-hand experience because I refuse to work on them, but I`ve studied the design and read the reports, this is one reason why I won't work on them. It needs to go to someone who's got experience with co-axial movements and that's likely to be an Omega service centre or an Omega accredited repairer. No idea how you do that from Malta.