That's most likely the reason then. Nearing the end of the 6 month or 12 month period LW will normally offer a discount to continue. At least I presume they still do this. I would recommend bookmarking your personal pro download page in future so you can keep in check about this nearing the end of your period. I think it's over the last 4 weeks of your pro they warn you. Also in LW settings there is an option to show if any updates so can be know if a new version is out.