Sync google calendar woes

[osborneuk]

I have always synced my calendar with google. This has worked well and covered 12 years of appointments. Now I've move to ios6 synching never ceases and new events are ignored. If I set it to sync 6 months all works ok. I suspect it's the amount of data it doesn't like. Is it possible to sync 24 months as a compromise? I know I could delete all appointments in my google calendar older than 2 years and then sync 'all events' but I.'m quite attached to my historical record which syncs with my PC. Thanks. Mike