Oh dear, not worked I'm afraid @Nou

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**      New record of system info started at 2022-05-20, 13:22:30      **
**   Total RAM available is 3.7GB and total SWAP available is  99MB.   **
**   Total space on micro SD card (located @/dev/root) is 116.935GB    **
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2022-05-20 13:22:34 Temp=38.9ºC. RAM 'Used':  8.3%; RAM 'Free': 82.5%; RAM in Shared:  1.4%; RAM in Buffer:  1.1%; RAM in Cache:  8.1%; RAM 'Available': 86.9%. Swap used:   0.0%. µSD has 51.071% free space.
2022-05-20 13:22:36 Temp=37.4ºC. RAM 'Used':  8.5%; RAM 'Free': 81.7%; RAM in Shared:  1.4%; RAM in Buffer:  1.1%; RAM in Cache:  8.6%; RAM 'Available': 86.5%. Swap used:   0.0%. µSD has 51.071% free space.
2022-05-20 13:22:38 Temp=38.4ºC. RAM 'Used':  8.8%; RAM 'Free': 81.2%; RAM in Shared:  1.4%; RAM in Buffer:  1.1%; RAM in Cache:  8.9%; RAM 'Available': 86.5%. Swap used:   0.0%. µSD has 51.071% free space.
2022-05-20 13:22:39 Temp=37.4ºC. RAM 'Used':  8.5%; RAM 'Free': 81.3%; RAM in Shared:  1.4%; RAM in Buffer:  1.1%; RAM in Cache:  9.2%; RAM 'Available': 86.8%. Swap used:   0.0%. µSD has 51.071% free space.

<+ 1 hour of lines cropped out>

2022-05-20 14:48:47 Temp=37.9ºC. RAM 'Used': 12.5%; RAM 'Free':  2.6%; RAM in Shared:  1.1%; RAM in Buffer:  1.6%; RAM in Cache: 83.4%; RAM 'Available': 82.5%. Swap used:   4.8%. µSD has 47.266% free space.
2022-05-20 14:48:48 Temp=37.9ºC. RAM 'Used': 12.6%; RAM 'Free':  2.5%; RAM in Shared:  1.1%; RAM in Buffer:  1.6%; RAM in Cache: 83.5%; RAM 'Available': 82.4%. Swap used:   4.8%. µSD has 47.264% free space.
2022-05-20 14:48:50 Temp=37.4ºC. RAM 'Used': 12.5%; RAM 'Free':  2.5%; RAM in Shared:  1.1%; RAM in Buffer:  1.6%; RAM in Cache: 83.5%; RAM 'Available': 82.4%. Swap used:   4.8%. µSD has 47.264% free space.
2022-05-20 14:48:51 Temp=37.0ºC. RAM 'Used': 12.5%; RAM 'Free':  2.3%; RAM in Shared:  1.1%; RAM in Buffer:  1.6%; RAM in Cache: 83.5%; RAM 'Available': 82.4%. Swap used:   4.8%. µSD has 47.262% free space.
2022-05-20 14:48:53 Temp=37.4ºC. RAM 'Used': 12.5%; RAM 'Free':  2.4%; RAM in Shared:  1.1%; RAM in Buffer:  1.6%; RAM in Cache: 83.5%; RAM 'Available': 82.4%. Swap used:   4.8%. µSD has 47.262% free space.

Swap getting used too. Interestingly, the micro SD card has 30% free before the restart, and then has 50% - I've not deleted any of the simulation *.bin files.

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