[bisq-network/bisq] Bisq using up too much memory on Linux even after closing (#3918)

[FKrauss]

### Description

Bisq will take more and more memory until the system freezes when none remains.
Additionally if shutdown before no memory is left, not all of it is released. About 4-7GB are shown to be additionally occupied, but no process seems to hold it. Logging out and in again does not fix it. A restart does.

#### Version

1.2.5

### Steps to reproduce

Unknown, just start the application for me.

### Expected behaviour

I expect bisq to take maybe 3GB of ram and released it after closing the application.

### Actual behaviour

More and more ram will be occupied until none is left and the system starts freezing. Sometimes bisq gets terminated by the system other times I just force reboot.

#### Device or machine

Ubuntu 18.04.3
Ryzen 5 2600X
G.Skill Aegis DIMM Kit 16GB

#### Additional info

The log contains a case where, after a reboot I started Bisq and got lucky. The application got terminated (I reacted too slow and could no longer move the mouse) after the ram was full. About 5.5GB of ram were shown to be still occupied after the termination.

[bisq.log](https://github.com/bisq-network/bisq/files/4117738/bisq.log)


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https://github.com/bisq-network/bisq/issues/3918
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