[Signals] Need help please- signals look fine, but dropouts keep happening

So I am helping this family with the IT topics. They don't speak English well, and very far away from IT. They switched to Xfinity Essential plan in the beginning of the year, and received the XB3 to use. From that moment on, the dropouts started happening. They've went through 3 replacement XB3s already. Technician came out 3 times and replaced portions of the coax. I was not present during the first 2 appointments, but during their last visit he completely replaced the coax coming from the amp to the f2f coupler. After their last visit, the issue seemed to be gone - it's been about 1.5 months - no dropouts. And last night, it happened again - for more than 45 minutes there was no internet :( What can cause such behavior? In the meantime, I'll place another call for the technician to come out and look at everything, but any idea would be much appreciated! Thank you! Signal levels: Downstream Channel Bonding Value Index 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Lock Status Locked Locked Locked Locked Locked Locked Locked Not Locked Locked Locked Not Locked Locked Locked Not Locked Locked Not Locked Not Locked Locked Locked Not Locked Locked Locked Locked Locked Not Locked Not Locked Not Locked Not Locked Not Locked Not Locked Not Locked Not Locked Frequency: 591.00 MHz 447.00 MHz 453.00 MHz 459.00 MHz 465.00 MHz 471.00 MHz 477.00 MHz 483.00 MHz 489.00 MHz 495.00 MHz 507.00 MHz 513.00 MHz 519.00 MHz 525.00 MHz 531.00 MHz 537.00 MHz 543.00 MHz 549.00 MHz 555.00 MHz 579.00 MHz 585.00 MHz 597.00 MHz 603.00 MHz 609.00 MHz SNR 38.98 dB 40.95 dB 40.37 dB 38.98 dB 40.37 dB 40.37 dB 40.37 dB ---- 38.61 dB 38.61 dB ---- 40.37 dB 40.37 dB ---- 40.95 dB ---- ---- 40.37 dB 40.37 dB ---- 38.98 dB 40.37 dB 38.98 dB 38.98 dB Power Level 2.30 dBmV 3.20 dBmV 3.50 dBmV 3.40 dBmV 3.50 dBmV 3.90 dBmV 4.00 dBmV ---- 4.00 dBmV 4.50 dBmV ---- 4.70 dBmV 5.00 dBmV ---- 4.80 dBmV ---- ---- 4.00 dBmV 3.90 dBmV ---- 2.70 dBmV 2.10 dBmV 2.60 dBmV 2.70 dBmV Modulation 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM 256 QAM ---- 256 QAM 256 QAM ---- 256 QAM 256 QAM ---- 256 QAM ---- ---- 256 QAM 256 QAM ---- 256 QAM 256 QAM 256 QAM 256 QAM Upstream Channel Bonding Value Index 1 2 3 4 5 6 7 8 Lock Status Locked Locked Locked Locked Locked Not Locked Not Locked Not Locked Frequency: 16.40 MHz 29.20 MHz 40.40 MHz 22.80 MHz 35.60 MHz Symbol Rate 5120 KSym/s 5120 KSym/s 2560 KSym/s 5120 KSym/s 5120 KSym/s Power Level 42.25 dBmV 43.50 dBmV 43.75 dBmV 42.75 dBmV 44.00 dBmV Modulation 64 QAM 64 QAM 64 QAM 64 QAM 64 QAM Channel Type DOCSIS2.0 (ATDMA) DOCSIS2.0 (ATDMA) DOCSIS2.0 (ATDMA) DOCSIS2.0 (ATDMA) DOCSIS2.0 (ATDMA) CM Error Codewords Unerrored Codewords 618045340 720794538 381145152 615419578 615420098 461499325 622301442 3957986500 615416986 622280792 3878166795 535624865 622308082 3958003107 615431591 3958013408 3958006781 622274557 622315929 3958018119 615441659 615451120 615463762 615467790 0 0 0 0 0 0 0 0 Correctable Codewords 8486 11007 9565 11307 10802 10333 11810 10368 13901 12136 9245 8349 10913 9717 9220 8185 8565 9920 11098 7870 9112 8546 8990 8971 0 0 0 0 0 0 0 0 Uncorrectable Codewords 25773 89336 24909 38476 43384 34840 55598 713825524 46651 73429 806481769 31315 57620 813770881 22734 813739650 813739129 69774 54352 813752928 33726 28297 39477 35754 0 0 0 0 0 0 0 0