I am sorry to read what you guys are going through. Many here have used Oxaliplatin on various occasions beyond their initial treatment. I believe the side effects are strong concerning neuropathy with Oxaliplatin, and breaks are part of the normal treatment approach. It is definitely not considered a maintenance drugs like Zeloda and Avastin are used.
Follow the recommendations of your Oncologist and seek a second opinion from your local major cancer center for your next plan of treatment, if needed again.
All the best going forward!
D/H 47 years old, 10/2014, Stage IV M/CRC, nodes 12/15, para-aortic, 5 cm sigmoid resection, positive Virchow. KRAS mut, MSS, Highly Differentiated, Lynch Neg, 5FU/LV and Avastin 1 YR (Oxi for 5 months), Zeloda/Bev since 01/2016. 02/2019 recurrence para-nodes, back to 5FU/LV Oxy/Bev. It is working again. "...Perseverance is not a long race; it is many short races one after the other."-Walter Elliot