3G data connection loss

Hello, I've set up a mini 3G RAN with yesterday's git repo. The phone works fine and successfully creates a PDP context, but data only works for a few minutes before it stops. Logs from SGSN and GGSN are as follows. Any help will be appreciated. <000e> sgsn_libgtp.c:175 PDP(450091417013617/0) Create PDP Context <0018> iu_client.c:530 handle_co(dir=4, proc=0) <0018> iu_client.c:530 handle_co(dir=1, proc=11) <0018> iu_client.c:530 handle_co(dir=2, proc=1) <0018> iu_client.c:507 handle_co_initial(dir=1, proc=19) <0018> iu_client.c:530 handle_co(dir=2, proc=6) <0002> gprs_gmm.c:208 GMM_ATTACH_REQ_FSM(gb_gmm_req)[0x221bd60]{Init}: Event IU Security Command Complete received. not permitted <0018> iu_client.c:599 Error in cn_ranap_handle_co (-1) <0018> iu_client.c:530 handle_co(dir=1, proc=20) <0018> iu_client.c:530 handle_co(dir=4, proc=0) <0018> iu_client.c:530 handle_co(dir=1, proc=11) <0018> iu_client.c:530 handle_co(dir=2, proc=1) <0018> iu_client.c:507 handle_co_initial(dir=1, proc=19) <0018> iu_client.c:530 handle_co(dir=2, proc=6)<0002> gprs_gmm.c:208 GMM_ATTACH_REQ_FSM(gb_gmm_req)[0x221bd60]{Init}: Event IU Security Command Complete received. not permitted <0018> iu_client.c:599 Error in cn_ranap_handle_co (-1) <0018> iu_client.c:530 handle_co(dir=1, proc=20) <0018> iu_client.c:530 handle_co(dir=4, proc=0) <0018> iu_client.c:530 handle_co(dir=1, proc=11) <0018> iu_client.c:530 handle_co(dir=2, proc=1) <0023> gtp.c:2800 Packet from 192.168.27.46:2152, length: 95 content: 32 ff 00 57 00 00 00 05 11 b4 00 00 45 00 00 53 ad fc 40 00 38 06 7b 5c 17 23 dd 7e c0 a8 64 02 01 bb cf 8c 78 70 5c a6 c2 6b 46 39 80 18 01 fc 05 54 00 00 01 01 08 0a 9f 6b cd 80 ff ff 61 96 15 03 03 00 1a 6e ec c9 35 4b a9 48 c5 23 b0 fa 35 a5 d6 e7 e5 5b 95 f0 38 45 0a cf c8 97 d1 : Unknown PDP context, GTPv1 <0023> gtp.c:2800 Packet from 192.168.27.46:2152, length: 64 content: 32 ff 00 38 00 00 00 05 11 b5 00 00 45 00 00 34 ad fd 40 00 38 06 7b 7a 17 23 dd 7e c0 a8 64 02 01 bb cf 8c 78 70 5c c5 c2 6b 46 39 80 11 01 fc dd ce 00 00 01 01 08 0a 9f 6b cd 80 ff ff 61 96 : Unknown PDP context, GTPv1 GGSN <0002> ggsn.c:735 PDP(450091417013617:5): Successful PDP Context Creation: APN=internet(internet), TEIC=1, IPv4=192.168.100.2, IPv6=none <000d> gtp.c:2761 Packet from 192.168.27.49:2152, length: 24 content: 32 1a 00 10 00 00 00 00 11 b4 00 00 10 00 00 00 05 85 00 04 c0 a8 1b 31 : Received Error Indication <0002> ggsn.c:372 PDP(450091417013617:5): Deleting PDP context <000d> gtp.c:2755 Packet from 192.168.27.49:2152, length: 24 content: 32 1a 00 10 00 00 00 00 11 b5 00 00 10 00 00 00 05 85 00 04 c0 a8 1b 31 : Unknown PDP context <000d> gtp.c:2117 Packet from 192.168.27.49:2123, length: 52 content: 32 12 00 2c 00 00 00 01 4c 0a 00 00 0e 13 10 00 00 00 05 14 05 85 00 04 c0 a8 1b 31 85 00 04 c0 a8 1b 2a 87 00 0e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 : Unknown PDP context: 1 <000d> gtp.c:2800 Packet from 192.168.27.42:2152, length: 72 content: 32 ff 00 40 00 00 00 01 00 00 00 00 45 00 00 3c 6f 51 40 00 40 06 08 fb c0 a8 64 02 d8 3a c5 8a cb 5a 01 bb 7a dc a8 09 00 00 00 00 a0 02 ff ff ce 3c 00 00 02 04 05 b4 04 02 08 0a ff ff c7 58 00 00 00 00 01 03 03 06 : Unknown PDP context, GTPv1 <000d> gtp.c:2800 Packet from 192.168.27.42:2152, length: 72 content: 32 ff 00 40 00 00 00 01 00 01 00 00 45 00 00 3c 6f 52 40 00 40 06 08 fa c0 a8 64 02 d8 3a c5 8a cb 5a 01 bb 7a dc a8 09 00 00 00 00 a0 02 ff ff cd 42 00 00 02 04 05 b4 04 02 08 0a ff ff c8 52 00 00 00 00 01 03 03 06 : Unknown PDP context, GTPv1 <000d> gtp.c:2800 Packet from 192.168.27.42:2152, length: 72 content: 32 ff 00 40 00 00 00 01 00 02 00 00 45 00 00 3c 6f 53 40 00 40 06 08 f9 c0 a8 64 02 d8 3a c5 8a cb 5a 01 bb 7a dc a8 09 00 00 00 00 a0 02 ff ff cb 4d 00 00 02 04 05 b4 04 02 08 0a ff ff ca 47 00 00 00 00 01 03 03 06 : Unknown PDP context, GTPv1