I have installed 4 packages only after a reset. Memory used was very less that time. After 4 months, i have noticed 128MB memory is full.
I dont think new packages are auto installed so it must be some log files or downloaded files somehow stored in internal memory rather than on external HDD.
Might be the index db for minidlna. Most people run it with an external mounted drive. As minidlna keeps building its database it consumes more memory.
Do a search for minidlna and memory usage and you’ll find many instances of this happening.