Yes it is reproducible 100% on this modem - I’d like to try a second device but unfortunately we don’t have stock due to current supply issues 
I also noticed
If I lock the RAT to GSM (KSRAT=1) the problem does not occur
AT+CGACT=1,2
OK
AT+CGACT=0,2
OK
With an LTE RAT (ksrat=0 (automatic)) - if I send the command a second time there is no ERROR. As follows
AT+CGACT?
+CGACT: 1,1
+CGACT: 2,1
AT+CGACT=0,2
ERROR
at+cgact?
+CGACT: 1,1
+CGACT: 2,0
AT+CGACT=0,2
OK
Requested AT commands - with KSRAT=0
AT!ENTERCND="A710"
AT!IMPREF?
!IMPREF:
preferred fw version: 02.37.03.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.095_000
preferred subpri index: 000
current fw version: 02.37.03.00
current carrier name: GENERIC
current config name: GENERIC_002.095_000
current subpri index: 000
AT+CGPADDR
+CGPADDR: 1,10.71.75.255
+CGPADDR: 2,0.0.0.0
AT!SCACT?
!SCACT: 1,0
!SCACT: 2,0
at+cgact?
+CGACT: 1,1
+CGACT: 2,0
Trying AT!SCACT to activate the context
at+ksrat?
+KSRAT: 0
AT!SCACT=1,2
+CME ERROR: no network service
AT!SCACT?
!SCACT: 1,0
!SCACT: 2,0
at!gstatus?
!GSTATUS:
Current Time: 3695 Temperature: 22
Modem Mitigate Level: 0 ModemProc Mitigate Level: 0
Reset Counter: 2 Mode: ONLINE
System mode: LTE PS state: Attached
IMS reg state: NOT REGISTERED IMS mode: Normal
IMS Srv State: NO SMS,NO VoIP
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1617 LTE Tx chan: 19617
LTE CA state: INACTIVE
EMM state: Registered Normal Service
RRC state: RRC Connected
PCC RxM RSSI: -69 RSRP (dBm): -97
PCC RxD RSSI: -95 RSRP (dBm): -139
Tx Power: -- TAC: 2B18 (11032)
RSRQ (dB): -10 Cell ID: 0052F702 (5437186)
SINR (dB): 8.8