Yes, it is unfortunate but websites need regular maintenance just like cars do… So, what happens if you neglect your car? Depending on the issue failures can be sudden or creeping.
Thus, regular maintenance such as updates, hosting, web fixes, upgrades, SEO, and spam checks need to be monitored and dealt with. If your developer has this service it might be wise to let them handle it. Unless of course you have someone better in mind and that’s not uncommon.