Random crashes

Not sure what triggers them; I just notice that the process has crashed. Apparently, the code just throws execptions and crashes.

started hangups child
Matrix-side listening on port 8091
[-] POST https://matrix.ser1.net/_matrix/client/r0/join/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t (AS) Body: "{}"
[-] POST https://matrix.ser1.net/_matrix/client/r0/join/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t (AS) HTTP 200 "{\"room_id\": \"!jjkTJrZibbDRdOfdDJ:matrix.ser1.net\"}"
[-] GET https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/state/m.room.power_levels/ (AS) Body: 
[-] GET https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/state/m.room.power_levels/ (AS) HTTP 200 "{\"users_default\": 0, \"events_default\": 0, \"
state_default\": 50, \"events\"
[-] PUT https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/state/m.room.power_levels (AS) Body: "{\"users_default\":0,\"events_default\":0,\"state_de
fault\":50,\"events\":{},\"
[-] PUT https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/state/m.room.power_levels (AS) HTTP 200 "{\"event_id\": \"$153818295691Gtyph:matrix.ser1.n
et\"}"
[-] PUT https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/state/m.room.power_levels (AS) Body: "{\"users_default\":0,\"events_default\":0,\"state_de
fault\":50,\"events\":{},\"
[-] PUT https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/state/m.room.power_levels (AS) HTTP 200 "{\"event_id\": \"$153818295692RyDGz:matrix.ser1.n
et\"}"
sendEvent of type m.room.message in !jjkTJrZibbDRdOfdDJ:matrix.ser1.net with txnId m15381829
56955.0
[-] PUT https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/send/m.room.message/m1538182956955.0 (AS) Body: "{\"body\":\"Attempting main loop...\\n_\"
,\"formatted_body\":\"<pre><code>Atte
[-] PUT https://matrix.ser1.net/_matrix/client/r0/rooms/!jjkTJrZibbDRdOfdDJ%3Amatrix.ser1.ne
t/send/m.room.message/m1538182956955.0 (AS) HTTP 200 "{\"event_id\": \"$153818295693cRAPY:ma
trix.ser1.net\"}"
Event sent to !jjkTJrZibbDRdOfdDJ:matrix.ser1.net with event id $153818295693cRAPY:matrix.se
r1.net
::1 - - [29/Sep/2018:01:02:39 +0000] "PUT /transactions/33?access_token=<REDACTED> HTTP/1.1"
 200 2 "-" "Synapse/0.33.5.1"

::1 - - [29/Sep/2018:01:02:39 +0000] "PUT /transactions/34?access_token=<REDACTED> HTTP/1.1"
 200 2 "-" "Synapse/0.33.5.1"

::1 - - [29/Sep/2018:01:02:47 +0000] "PUT /transactions/35?access_token=<REDACTED> HTTP/1.1"
 200 2 "-" "Synapse/0.33.5.1"

events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: write EPIPE
    at WriteWrap.afterWrite [as oncomplete] (net.js:788:14)
Emitted 'error' event at:
    at onwriteError (_stream_writable.js:431:12)
    at onwrite (_stream_writable.js:456:5)
    at _destroy (internal/streams/destroy.js:40:7)
    at Socket._destroy (net.js:613:3)
    at Socket.destroy (internal/streams/destroy.js:32:8)
    at WriteWrap.afterWrite [as oncomplete] (net.js:790:10)

Python: 3.5.3
Node: v10.11.0
Hangups: 0.4.5

I don't know how the hell to tell which version of synapse I'm running. Something I downloaded within the past week.