Given the amount of past outages of ccTLDs we've seen (almost none), i'd say this problem is negligible and nothing to worry about.
There is one very recent exception however, the russian plans to partly separate from the internet shortly (especially regarding DNS) could well be an issue.
Technical and legal issues that cause issues for customers at small ccTLDs are not uncommon. It all depends on who is running the registry. Try "cctld hijacked" and "cctld downtime" in your favorite search engine for a dozen or so examples.
Registries range in resources from "highly experienced billion-dollar organizations", to literally "we have a guy who updates the zone file in notepad", and they range in legal environment from, "functional democratic state with well-established judiciary" to "our government was violently overthrown this week".
Whether or not the problem is negligible depends on your particular use-case. For some, it might be a good choice, for others, it might not be.
There is one very recent exception however, the russian plans to partly separate from the internet shortly (especially regarding DNS) could well be an issue.