Update 10.20 won't install on Vivoactive 5

Having a problem with update 10.20 every hour or two it tells me it's ready to install, I select to install, it runs the course and restarts then later notification that 10.20 is ready to install again. Probably gone through the process 20 times now but doesn't seem to work. Any advice/solution?

I lost my watch for a couple of months and just turned it back on a week or so ago, not sure if that may be relevant i.e.trying to update more than one or two software version progressions causing an issue?