[IL] Connection issues

I have an Arris SB8200 that I've been using, without issues, for a few months on the Xtreme plan. Lately, I've noticed that when I start to download more then one item at a time (two movies, newsgroups, etc), the modem constantly drops and the reconnects. However, after doing this a few time, it drops and then I have to power cycle the modem to get bac online. Today I took a look at the event log on the modem, and I noticed these errors: 10-8-2017, 20:58:4 Critical(3) "SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:57:56 Critical(3) "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:57:53 Critical(3) "SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:57:48 Critical(3) "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:57:6 Critical(3) "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:57:5 Critical(3) "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:49:59 Critical(3) "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:49:35 Critical(3) "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:48:22 Critical(3) "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:48:14 Critical(3) "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:47:52 Critical(3) "SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:47:42 Critical(3) "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" 10-8-2017, 20:47:38 Critical(3) "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=5c:e3:0e:72:99:91;CMTS-MAC=00:17:10:92:dc:07;CM-QOS=1.1;CM-VER=3.1;" Any ideas? Do I need a new modem (again)? Thanks.