Yes i have seen a few as well. Unforunately i think what has happened is when the web hosting provider moved musicbee to a new server, they reduced the memory allocation for PHP - probably in order to squeeze more sites onto the one shared server (I dont know this for a fact but it I think its very plausible based on what I know).
When the site runs slow, often i see a spike on cloudfare for invalid requests.
Apart from the planned change AvikB will do for the addons page, I dont think there is much more that can be done short of getting a dedicated web server which is very expensive.
If anyone reading this is a server administrator or knowledgeable about web hosting i would be interested in any comments.