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AT_CLIENT Returning Error

I'm running the at_client project one of our custom boards and am able to see the "AT host sample started" message, but it only responds to the first "AT" I sent. Any commands I enter after that return an ERROR;

Peripheral              Domain          Status
00 NRF_P0               Non-Secure      OK
01 NRF_CLOCK            Non-Secure      OK
02 NRF_RTC1             Non-Secure      OK
03 NRF_NVMC             Non-Secure      OK
04 NRF_UARTE1           Non-Secure      OK
05 NRF_UARTE2           Secure          SKIP
06 NRF_TWIM2            Non-Secure      OK
07 NRF_SPIM3            Non-Secure      OK
08 NRF_TIMER0           Non-Secure      OK
09 NRF_TIMER1           Non-Secure      OK
10 NRF_TIMER2           Non-Secure      OK
11 NRF_SAADC            Non-Secure      OK
12 NRF_PWM0             Non-Secure      OK
13 NRF_PWM1             Non-Secure      OK
14 NRF_PWM2             Non-Secure      OK
15 NRF_PWM3             Non-Secure      OK
16 NRF_WDT              Non-Secure      OK
17 NRF_IPC              Non-Secure      OK
18 NRF_VMC              Non-Secure      OK
19 NRF_FPU              Non-Secure      OK
20 NRF_EGU1             Non-Secure      OK
21 NRF_EGU2             Non-Secure      OK
22 NRF_DPPIC            Non-Secure      OK
23 NRF_GPIOTE1          Non-Secure      OK
24 NRF_REGULATORS       Secure          SKIP

SPM: NS image at 0xc000
SPM: NS MSP at 0x20027f48
SPM: NS reset vector at 0xde89
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS build v2.0.99-ncs1-1-gb50c524b7c08 *****

The AT host sample started

AT
OK

AT
ERROR

AT+CFUN?
ERROR

The same firmware on the PCA10090 works fine and I am able to issue AT commands. The problem board also has no problems running code that makes use of the modem for LTE/GPS.

Modem FW v1.1.0

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