Server hosted on Raspberry pi 2B crashes every 15min
5 worlds is quite daring for a Raspberry Pi, even with 1 GiB of RAM. You might want to lower the per-world viewdistance limit and the spawn area size, so that the server doesn't need to keep too many chunks in the RAM and tick them.

You could try running the server under GDB and providing more info, as per the "Reporting Linux crashes" thread:

We do indeed have a server running on a Raspberry Pi with 512 MiB RAM, but to be honest, it is limited - one world, low viewdistance limit, most simulators are turned off etc. With this config, it does run and has successfully hosted 7 players (crashed with 8 players, out of memory).
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