As Mrs Vimes said, if you are out of work and are not signing on, then there will be a gap in your PRSI contribution record which may lead to a shortfall of contributions in future years. If you sign on, you'll get a credited contribution which maintains your record.
If you were to sign on over the next couple of years, the gap may give rise to queries about your working pattern.
If you'll be back to work in 2 months, then claiming now won't affect your ability to claim in the future (as you'll be paying PRSI contributions again and will re-qualify after a number of weeks in work), and if the lay-off lasts longer than expected, you won't be using up your savings.