I think you will find that residence takes 3 years to give up, and also 3 years to achieve. Even though you may be a citizen, i believe, because i was told in UK and another Country i moved to, that it takes 3 years. Something to do with the electorate roll, welfare benefit laws, and national insurance contributions.
So even though you leave the country, you still have voting rights...the same problem occurs when you move back, in UK especially I was not allowed to vote, because i hadn't lived in the UK for 3 years... Some crazy bullshit armchair bureaucratic system they have in UK and probably the Common Wealth Countries signed up for it.

Does nobody realise in government that the world is moving and these bureaucratic systems have stood still for 200 years.
This problem is a real hitch for UK citizens, I don't know about Canada, But a UK citizen if married to a foreign spouse, can find it very difficult to move the family back, and immigration normally deport the spouse until all the paper work is done.
One cannot just move back to settle, because the residence rules apply, the foreign spouse may not claim any help whatsoever until she/he becomes a resident. and that is 3 years.
Yet immigrants that are smuggled in can draw unemployment benefits, and sign on in different Cities.
Identity theft is a big problem in UK, so it is always best to tell the local Town Halls, that you are moving abroad. and the national insurance department, otherwise you may return to an unwanted arrest warrant.
The arrest warrants stay active 5 years. So I would suggest to notify the embassy you are here, and to ask them to notify those that should be notified in Canada with regards to jury service.